diff --git a/src/tests/kits/support/string_utf8_tests.cpp b/src/tests/kits/support/string_utf8_tests.cpp
index 070f467a4a..c043add103 100644
--- a/src/tests/kits/support/string_utf8_tests.cpp
+++ b/src/tests/kits/support/string_utf8_tests.cpp
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include <SupportDefs.h>
 #include <String.h>
 #include <InterfaceDefs.h>