diff --git a/test/opt/assembly_builder.h b/test/opt/assembly_builder.h
old mode 100644
new mode 100755
index 855a546e4..964cab63c
--- a/test/opt/assembly_builder.h
+++ b/test/opt/assembly_builder.h
@@ -28,6 +28,7 @@
 #define LIBSPIRV_TEST_OPT_ASSEMBLY_BUILDER
 
 #include <algorithm>
+#include <cstdint>
 #include <sstream>
 #include <string>
 #include <unordered_set>