diff --git a/test/test_SchereSteinPapier.c b/test/test_SchereSteinPapier.c
index aa5b429..80a348d 100644
--- a/test/test_SchereSteinPapier.c
+++ b/test/test_SchereSteinPapier.c
@@ -4,6 +4,8 @@
 
 #include "SchereSteinPapier.h"
 
+#include <stdlib.h>
+
 void setUp(void)
 {
 }