diff --git a/sumo/src/utils/common/SysUtils.cpp b/sumo/src/utils/common/SysUtils.cpp
index 95470e5d2fad..287c08b36abc 100644
--- a/sumo/src/utils/common/SysUtils.cpp
+++ b/sumo/src/utils/common/SysUtils.cpp
@@ -26,6 +26,7 @@
 #include <config.h>
 #endif
 
+#include <stdlib.h>
 #include "SysUtils.h"
 
 #ifndef WIN32