diff --git a/src/abg-hash.cc b/src/abg-hash.cc
index 53cc4b0f..5e1df61b 100644
--- a/src/abg-hash.cc
+++ b/src/abg-hash.cc
@@ -565,7 +565,8 @@ class_decl::hash::operator()(const class_decl& t) const
 	       t.get_member_functions().begin();
 	     f != t.get_member_functions().end();
 	     ++f)
-	  v = hashing::combine_hashes(v, hash_member_fn(**f));
+	  if (member_function_is_virtual(*f))
+	    v = hashing::combine_hashes(v, hash_member_fn(**f));
 
 	// Hash member function templates
 	for (class_decl::member_function_templates::const_iterator f =