diff --git a/src/gc.c b/src/gc.c
index 10fb6e95dceb56a3e2e734689ba90301d47c02b1..0693d31cc44c4369cbc3b4d4f78149de1be717ba 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -352,7 +352,7 @@ int gc_external_mark(void *a)
     if(a==check_for)
     {
       char *tmp=found_where;
-      found_where="externally";
+      found_where=" externally";
       gdb_gc_stop_here(a);
       found_where=tmp;