diff --git a/commonTools/gtest/gtest/gtest-all.cc b/commonTools/gtest/gtest/gtest-all.cc
index cef5397f..bfe2d02d 100644
--- a/commonTools/gtest/gtest/gtest-all.cc
+++ b/commonTools/gtest/gtest/gtest-all.cc
@@ -33,6 +33,8 @@
 // Sometimes it's desirable to build Google Test by compiling a single file.
 // This file serves this purpose.
 
+#include <cstdint>
+
 // This line ensures that gtest.h can be compiled on its own, even
 // when it's fused.
 #include "gtest/gtest.h"