diff --git a/ChangeLog b/ChangeLog
index 3053e6d251..57394d6afe 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Fri Nov 22 09:03:16 2013  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* gc.c: fix build failure on FreeBSD introduced by r43763.
+	  malloc_usable_size() is defined by malloc_np.h on FreeBSD.
+
+	* configure.in: check malloc.h and malloc_np.h.
+
 Fri Nov 22 08:27:13 2013  Eric Hodel  <drbrain@segment7.net>
 
 	* lib/rubygems:  Update to RubyGems master 50a8210.  Important changes
diff --git a/configure.in b/configure.in
index 923843fe6f..5d86e14bd0 100644
--- a/configure.in
+++ b/configure.in
@@ -1091,6 +1091,8 @@ AC_CHECK_HEADERS( \
   process.h \
   sys/prctl.h \
   atomic.h \
+  malloc.h \
+  malloc_np.h \
   setjmpex.h
 )
 
diff --git a/gc.c b/gc.c
index d34ff9c4de..0f111cdbf3 100644
--- a/gc.c
+++ b/gc.c
@@ -40,7 +40,11 @@
 #   define malloc_usable_size(a) _msize(a)
 # endif
 #else
-# include <malloc.h>
+# ifdef HAVE_MALLOC_H
+#  include <malloc.h>
+# elif defined(HAVE_MALLOC_NP_H)
+#  include <malloc_np.h>
+# endif
 #endif
 
 #if /* is ASAN enabled? */ \