diff --git a/external/openglcts/modules/runner/glcTestRunnerMain.cpp b/external/openglcts/modules/runner/glcTestRunnerMain.cpp
index 2e5f009..7261f71 100644
--- a/external/openglcts/modules/runner/glcTestRunnerMain.cpp
+++ b/external/openglcts/modules/runner/glcTestRunnerMain.cpp
@@ -29,6 +29,7 @@
 #include "tcuResource.hpp"
 
 #include <cstdio>
+#include <cstdlib>
 
 // See tcuMain.cpp
 tcu::Platform* createPlatform(void);