diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0f3a6c6..681ddaa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -258,6 +258,7 @@ if(gperftools_enable_libunwind)
     if(have_libunwind)
       set(unwind_libs ${libunwind_location})
       set(will_use_libunwind ON)
+      set(USE_LIBUNWIND 1)
     endif()
   endif()
 endif()
diff --git a/cmake/config.h.in b/cmake/config.h.in
index 3748271..f29d811 100644
--- a/cmake/config.h.in
+++ b/cmake/config.h.in
@@ -98,6 +98,8 @@
 /* Define to 1 if you have the <libunwind.h> header file. */
 #cmakedefine HAVE_LIBUNWIND_H
 
+#cmakedefine USE_LIBUNWIND
+
 /* Define to 1 if you have the <linux/ptrace.h> header file. */
 #cmakedefine HAVE_LINUX_PTRACE_H
 
diff --git a/configure.ac b/configure.ac
index 698f2c7..766856d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -272,8 +272,10 @@ AM_CONDITIONAL(ENABLE_STATIC, test "$enable_static" = yes)
 UNWIND_LIBS=
 if test "$enable_libunwind" = yes; then
   AC_CHECK_HEADERS([libunwind.h],
-                   [AC_CHECK_LIB(unwind, backtrace, UNWIND_LIBS=-lunwind)
-                    will_use_libunwind=yes])
+                   [AC_CHECK_LIB(unwind, backtrace,
+                     [UNWIND_LIBS=-lunwind
+                      AC_DEFINE([USE_LIBUNWIND], [1], [libunwind.h was found and is working])
+                      will_use_libunwind=yes])])
 fi
 AC_SUBST(UNWIND_LIBS)
 
diff --git a/src/stacktrace.cc b/src/stacktrace.cc
index 32b16fa..4d85856 100644
--- a/src/stacktrace.cc
+++ b/src/stacktrace.cc
@@ -102,14 +102,14 @@ struct GetStackImplementation {
 
 // libunwind uses __thread so we check for both libunwind.h and
 // __thread support
-#if defined(HAVE_LIBUNWIND_H) && defined(HAVE_TLS)
+#if defined(USE_LIBUNWIND) && defined(HAVE_TLS)
 #define STACKTRACE_INL_HEADER "stacktrace_libunwind-inl.h"
 #define GST_SUFFIX libunwind
 #include "stacktrace_impl_setup-inl.h"
 #undef GST_SUFFIX
 #undef STACKTRACE_INL_HEADER
 #define HAVE_GST_libunwind
-#endif // HAVE_LIBUNWIND_H
+#endif // USE_LIBUNWIND
 
 #if defined(__i386__) || defined(__x86_64__)
 #define STACKTRACE_INL_HEADER "stacktrace_x86-inl.h"