diff --git a/programs/develop/ktcc/trunk/libc.obj/source/stdlib/calloc.c b/programs/develop/ktcc/trunk/libc.obj/source/stdlib/calloc.c
index 846096c52c..0fd70a627c 100644
--- a/programs/develop/ktcc/trunk/libc.obj/source/stdlib/calloc.c
+++ b/programs/develop/ktcc/trunk/libc.obj/source/stdlib/calloc.c
@@ -1,6 +1,13 @@
 #include <stdlib.h>
+#include <errno.h>
 #include <sys/ksys.h>
 
 void *calloc(size_t num, size_t size) {
-    return _ksys_alloc(num*size);
-}
\ No newline at end of file
+    void *ptr = _ksys_alloc(num*size);
+    if(!ptr){
+        errno = ENOMEM;
+        return NULL;
+    }
+    memset(ptr, 0, num*size);
+    return ptr;
+}