diff --git a/umem_test.c b/umem_test.c
index 113139a..546bf5e 100644
--- a/umem_test.c
+++ b/umem_test.c
@@ -1,3 +1,7 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
 #include "umem.h"
 
 int main(int argc, char *argv[])