diff --git a/lib/memdebug.h b/lib/memdebug.h
index 87df8f2971245ba2f6750b394ab068fbbfa810ba..ebb338210c985b2f497ae43eabff831276656414 100644
--- a/lib/memdebug.h
+++ b/lib/memdebug.h
@@ -1,4 +1,4 @@
-#ifdef MALLOCDEBUG
+#ifdef CURLDEBUG
 /***************************************************************************
  *                                  _   _ ____  _     
  *  Project                     ___| | | |  _ \| |