kc3-lang/SDL

diff --git a/test/testoverlay2.c b/test/testoverlay2.c
index 6da1f96..af93f91 100644
--- a/test/testoverlay2.c
+++ b/test/testoverlay2.c
@@ -16,6 +16,8 @@
  *                                                                              *
  ********************************************************************************/
 
+#include <stdlib.h>
+
 #ifdef __EMSCRIPTEN__
 #include <emscripten/emscripten.h>
 #endif