--- guile-1.6-1.6.4.orig/libguile/gc.c
+++ guile-1.6-1.6.4/libguile/gc.c
@@ -2051,9 +2051,9 @@
     scm_must_free() won't take NULL.
   */
   scm_mallocated += size - old_size;
-  SCM_SYSCALL (ptr = realloc (where, size));
-
   check_mtrigger (what);
+
+  SCM_SYSCALL (ptr = realloc (where, size));
   
   if (NULL != ptr)
     {