diff --git a/extern/cloop/src/tests/test1/CTest.c b/extern/cloop/src/tests/test1/CTest.c
index a3739ce411..b2a5b00b55 100644
--- a/extern/cloop/src/tests/test1/CTest.c
+++ b/extern/cloop/src/tests/test1/CTest.c
@@ -20,7 +20,7 @@
  */
 
 #include "CalcCApi.h"
-#include <malloc.h>
+#include <stdlib.h>
 #include <stdio.h>
 
 #ifdef WIN32