diff --git a/SPIRV/SpvBuilder.h b/SPIRV/SpvBuilder.h
index f86dd81b3..d688436a6 100644
--- a/SPIRV/SpvBuilder.h
+++ b/SPIRV/SpvBuilder.h
@@ -56,6 +56,7 @@ namespace spv {
 }
 
 #include <algorithm>
+#include <cstdint>
 #include <map>
 #include <memory>
 #include <set>