diff --git a/src/base/ftdbgmem.c b/src/base/ftdbgmem.c
index 1df83c404..e17742f4e 100644
--- a/src/base/ftdbgmem.c
+++ b/src/base/ftdbgmem.c
@@ -874,7 +874,7 @@
   }
 
 
-  static int
+  FT_COMPARE_DEF( int )
   ft_mem_source_compare( const void*  p1,
                          const void*  p2 )
   {