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-rw-r--r--malloc/mcheck.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/malloc/mcheck.c b/malloc/mcheck.c
index 4547a31299..c5baa3d4a7 100644
--- a/malloc/mcheck.c
+++ b/malloc/mcheck.c
@@ -246,5 +246,5 @@ mcheck (func)
 enum mcheck_status
 mprobe (__ptr_t ptr)
 {
-  return mcheck_used ? checkhdr (ptr) : MCHECK_DISABLED;
+  return mcheck_used ? checkhdr (((struct hdr *) ptr) - 1) : MCHECK_DISABLED;
 }