2 files changed, 2 insertions, 4 deletions
diff --git a/malloc.c b/malloc.c
index c1e2ed2c..ef269095 100644
--- a/malloc.c
+++ b/malloc.c
@@ -355,9 +355,8 @@ GC_API void * GC_CALL GC_malloc_uncollectable(size_t lb)
 /* malloc replacements.  Otherwise we end up saving a                   */
 /* meaningless return address in the object.  It also speeds things up, */
 /* but it is admittedly quite ugly.                                     */
-
 # define GC_debug_malloc_replacement(lb) \
-                        GC_debug_malloc(lb, GC_DBG_RA "unknown", 0)
+                        GC_debug_malloc(lb, GC_DBG_RA NULL, 0)
 
 void * malloc(size_t lb)
 {
diff --git a/mallocx.c b/mallocx.c
index d3fbed27..1b4e09b8 100644
--- a/mallocx.c
+++ b/mallocx.c
@@ -153,9 +153,8 @@ GC_API void * GC_CALL GC_realloc(void * p, size_t lb)
 # ifdef REDIRECT_REALLOC
 
 /* As with malloc, avoid two levels of extra calls here.        */
-
 # define GC_debug_realloc_replacement(p, lb) \
-        GC_debug_realloc(p, lb, GC_DBG_RA "unknown", 0)
+        GC_debug_realloc(p, lb, GC_DBG_RA NULL, 0)
 
 void * realloc(void * p, size_t lb)
   {