diff --git a/include/abg-comparison.h b/include/abg-comparison.h
index 48818577..2c1008da 100644
--- a/include/abg-comparison.h
+++ b/include/abg-comparison.h
@@ -898,6 +898,15 @@ public:
   edit_script&
   base_changes();
 
+  const string_base_sptr_map&
+  deleted_bases() const;
+
+  const string_base_sptr_map&
+  inserted_bases() const;
+
+  const string_changed_base_map&
+  changed_bases();
+
   const edit_script&
   member_types_changes() const;
 
diff --git a/src/abg-comp-filter.cc b/src/abg-comp-filter.cc
index 4ea9ce6e..a6247086 100644
--- a/src/abg-comp-filter.cc
+++ b/src/abg-comp-filter.cc
@@ -484,6 +484,28 @@ static bool
 has_non_virtual_mem_fn_change(const diff* diff)
 {return has_non_virtual_mem_fn_change(dynamic_cast<const class_diff*>(diff));}
 
+/// Test if a class_diff carries base classes adding or removals.
+///
+/// @param diff the class_diff to consider.
+///
+/// @return true iff @p diff carries base classes adding or removals.
+static bool
+base_classes_added_or_removed(const class_diff* diff)
+{
+  if (!diff)
+    return false;
+  return diff->deleted_bases().size() || diff->inserted_bases().size();
+}
+
+/// Test if a class_diff carries base classes adding or removals.
+///
+/// @param diff the class_diff to consider.
+///
+/// @return true iff @p diff carries base classes adding or removals.
+static bool
+base_classes_added_or_removed(const diff* diff)
+{return base_classes_added_or_removed(dynamic_cast<const class_diff*>(diff));}
+
 /// The visiting code of the harmless_filter.
 ///
 /// @param d the diff node being visited.
@@ -552,7 +574,8 @@ harmful_filter::visit(diff* d, bool pre)
       if (type_size_changed(f, s)
 	  || data_member_offset_changed(f, s)
 	  || non_static_data_member_type_size_changed(f, s)
-	  || non_static_data_member_added_or_removed(d))
+	  || non_static_data_member_added_or_removed(d)
+	  || base_classes_added_or_removed(d))
 	category |= SIZE_OR_OFFSET_CHANGE_CATEGORY;
 
       if (has_virtual_mem_fn_change(d))
diff --git a/src/abg-comparison.cc b/src/abg-comparison.cc
index a1601425..673dbb4a 100644
--- a/src/abg-comparison.cc
+++ b/src/abg-comparison.cc
@@ -3194,6 +3194,30 @@ const edit_script&
 class_diff::base_changes() const
 {return priv_->base_changes_;}
 
+/// Getter for the deleted base classes of the diff.
+///
+/// @return a map containing the deleted base classes, keyed with
+/// their pretty representation.
+const string_base_sptr_map&
+class_diff::deleted_bases() const
+{return priv_->deleted_bases_;}
+
+/// Getter for the inserted base classes of the diff.
+///
+/// @return a map containing the inserted base classes, keyed with
+/// their pretty representation.
+const string_base_sptr_map&
+class_diff::inserted_bases() const
+{return priv_->inserted_bases_;}
+
+/// Getter for the changed base classes of the diff.
+///
+/// @return a map containing the changed base classes, keyed with
+/// their pretty representation.
+const string_changed_base_map&
+class_diff::changed_bases()
+{return priv_->changed_bases_;}
+
 /// @return the edit script of the bases of the two classes.
 edit_script&
 class_diff::base_changes()
diff --git a/tests/Makefile.am b/tests/Makefile.am
index f8a1003c..6fcf5494 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -152,6 +152,11 @@ data/test-diff-dwarf/test7-v0.o			\
 data/test-diff-dwarf/test7-v1.cc		\
 data/test-diff-dwarf/test7-v1.o			\
 data/test-diff-dwarf/test7-report.txt		\
+data/test-diff-dwarf/test8-v0.cc		\
+data/test-diff-dwarf/test8-v0.o			\
+data/test-diff-dwarf/test8-v1.cc		\
+data/test-diff-dwarf/test8-v1.o			\
+data/test-diff-dwarf/test8-report.txt		\
 \
 data/test-read-dwarf/test0			\
 data/test-read-dwarf/test0.abi			\
@@ -224,7 +229,12 @@ data/test-diff-filter/test12-v0.cc		\
 data/test-diff-filter/test12-v1.cc		\
 data/test-diff-filter/test12-v0.o		\
 data/test-diff-filter/test12-v1.o		\
-data/test-diff-filter/test12-report.txt
+data/test-diff-filter/test12-report.txt		\
+data/test-diff-filter/test13-v0.cc		\
+data/test-diff-filter/test13-v1.cc		\
+data/test-diff-filter/test13-v0.o		\
+data/test-diff-filter/test13-v1.o		\
+data/test-diff-filter/test13-report.txt
 
 clean-local: clean-local-check
 .PHONY: clean-local-check
diff --git a/tests/data/test-diff-dwarf/test8-report.txt b/tests/data/test-diff-dwarf/test8-report.txt
new file mode 100644
index 00000000..aba1e688
--- /dev/null
+++ b/tests/data/test-diff-dwarf/test8-report.txt
@@ -0,0 +1,30 @@
+Functions changes summary: 0 Removed, 1 Changed, 1 Added functions
+Variables changes summary: 0 Removed, 0 Changed, 0 Added variable
+
+1 function with some indirect sub-type change:
+
+  [C]'function void foo(const S&)' has some indirect sub-type changes:
+    parameter 0 of type 'const S&' has sub-type changes:
+      in unqualified underlying type 'S&':
+        in referenced type 'struct S':
+          size changed from 64 to 96 bits
+          1 base class change:
+            'struct B0' changed:
+              1 data member change:
+               'char B0::m0' access changed from 'public' to 'private'
+
+
+          1 base class insertion:
+            class B1
+          1 data member change:
+           'int S::m0' offset changed from 32 to 64, access changed from 'public' to 'private'
+           and its type 'int' changed:
+             name changed from 'int' to 'char'
+             size changed from 32 to 8 bits
+             alignment changed from 32 to 8 bits
+
+
+1 Added function:
+  'method B1::B1()'
+
+
diff --git a/tests/data/test-diff-dwarf/test8-v0.cc b/tests/data/test-diff-dwarf/test8-v0.cc
new file mode 100644
index 00000000..a86dd858
--- /dev/null
+++ b/tests/data/test-diff-dwarf/test8-v0.cc
@@ -0,0 +1,21 @@
+struct B0
+{
+  char m0;
+
+  B0()
+    : m0(0)
+  {}
+};
+
+struct S : public B0
+{
+  int m0;
+
+  S()
+    : m0(0)
+  {}
+};
+
+void
+foo(S&)
+{}
diff --git a/tests/data/test-diff-dwarf/test8-v0.o b/tests/data/test-diff-dwarf/test8-v0.o
new file mode 100644
index 00000000..050c0c21
Binary files /dev/null and b/tests/data/test-diff-dwarf/test8-v0.o differ
diff --git a/tests/data/test-diff-dwarf/test8-v1.cc b/tests/data/test-diff-dwarf/test8-v1.cc
new file mode 100644
index 00000000..88008643
--- /dev/null
+++ b/tests/data/test-diff-dwarf/test8-v1.cc
@@ -0,0 +1,33 @@
+class B0
+{
+  char m0;
+
+public:
+  B0()
+    : m0(0)
+  {}
+};
+
+class B1
+{
+  unsigned m0;
+
+public:
+  B1()
+    : m0(0)
+  {}
+};
+
+class S : public B0, public B1
+{
+  char m0;
+
+public:
+  S()
+    : m0(0)
+  {}
+};
+
+void
+foo(S&)
+{}
diff --git a/tests/data/test-diff-dwarf/test8-v1.o b/tests/data/test-diff-dwarf/test8-v1.o
new file mode 100644
index 00000000..fd659868
Binary files /dev/null and b/tests/data/test-diff-dwarf/test8-v1.o differ
diff --git a/tests/data/test-diff-filter/test13-report.txt b/tests/data/test-diff-filter/test13-report.txt
new file mode 100644
index 00000000..7f7a1948
--- /dev/null
+++ b/tests/data/test-diff-filter/test13-report.txt
@@ -0,0 +1,24 @@
+Functions changes summary: 0 Removed, 1 Changed, 1 Added functions
+Variables changes summary: 0 Removed, 0 Changed, 0 Added variable
+
+1 function with some indirect sub-type change:
+
+  [C]'function void foo(const S&)' has some indirect sub-type changes:
+    parameter 0 of type 'const S&' has sub-type changes:
+      in unqualified underlying type 'S&':
+        in referenced type 'struct S':
+          size changed from 64 to 96 bits
+          no base class change (1 filtered);
+          1 base class insertion:
+            class B1
+          1 data member change:
+           'int S::m0' offset changed from 32 to 64
+           and its type 'int' changed:
+             size changed from 32 to 8 bits
+             alignment changed from 32 to 8 bits
+
+
+1 Added function:
+  'method B1::B1()'
+
+
diff --git a/tests/data/test-diff-filter/test13-v0.cc b/tests/data/test-diff-filter/test13-v0.cc
new file mode 100644
index 00000000..a86dd858
--- /dev/null
+++ b/tests/data/test-diff-filter/test13-v0.cc
@@ -0,0 +1,21 @@
+struct B0
+{
+  char m0;
+
+  B0()
+    : m0(0)
+  {}
+};
+
+struct S : public B0
+{
+  int m0;
+
+  S()
+    : m0(0)
+  {}
+};
+
+void
+foo(S&)
+{}
diff --git a/tests/data/test-diff-filter/test13-v0.o b/tests/data/test-diff-filter/test13-v0.o
new file mode 100644
index 00000000..2be53a36
Binary files /dev/null and b/tests/data/test-diff-filter/test13-v0.o differ
diff --git a/tests/data/test-diff-filter/test13-v1.cc b/tests/data/test-diff-filter/test13-v1.cc
new file mode 100644
index 00000000..88008643
--- /dev/null
+++ b/tests/data/test-diff-filter/test13-v1.cc
@@ -0,0 +1,33 @@
+class B0
+{
+  char m0;
+
+public:
+  B0()
+    : m0(0)
+  {}
+};
+
+class B1
+{
+  unsigned m0;
+
+public:
+  B1()
+    : m0(0)
+  {}
+};
+
+class S : public B0, public B1
+{
+  char m0;
+
+public:
+  S()
+    : m0(0)
+  {}
+};
+
+void
+foo(S&)
+{}
diff --git a/tests/data/test-diff-filter/test13-v1.o b/tests/data/test-diff-filter/test13-v1.o
new file mode 100644
index 00000000..ebd39810
Binary files /dev/null and b/tests/data/test-diff-filter/test13-v1.o differ
diff --git a/tests/test-diff-dwarf.cc b/tests/test-diff-dwarf.cc
index 51dc3120..7ce154a5 100644
--- a/tests/test-diff-dwarf.cc
+++ b/tests/test-diff-dwarf.cc
@@ -108,7 +108,13 @@ InOutSpec in_out_specs[] =
     "data/test-diff-dwarf/test7-v0.o",
     "data/test-diff-dwarf/test7-v1.o",
     "data/test-diff-dwarf/test7-report.txt",
-    "output/test-diff-dwarf/test6-report.txt"
+    "output/test-diff-dwarf/test7-report.txt"
+  },
+  {
+    "data/test-diff-dwarf/test8-v0.o",
+    "data/test-diff-dwarf/test8-v1.o",
+    "data/test-diff-dwarf/test8-report.txt",
+    "output/test-diff-dwarf/test8-report.txt"
   },
   // This should be the last entry
   {NULL, NULL, NULL, NULL}
diff --git a/tests/test-diff-filter.cc b/tests/test-diff-filter.cc
index 0a3d4866..a1c3614c 100644
--- a/tests/test-diff-filter.cc
+++ b/tests/test-diff-filter.cc
@@ -152,6 +152,13 @@ InOutSpec in_out_specs[] =
     "data/test-diff-filter/test12-report.txt",
     "output/test-diff-filter/test12-report.txt",
   },
+  {
+    "data/test-diff-filter/test13-v0.o",
+    "data/test-diff-filter/test13-v1.o",
+    "--no-harmless",
+    "data/test-diff-filter/test13-report.txt",
+    "output/test-diff-filter/test13-report.txt",
+  },
   // This should be the last entry
   {NULL, NULL, NULL, NULL, NULL}
 };