diff --git a/kokoro/release/protoc/macos/build.sh b/kokoro/release/protoc/macos/build.sh
index db9d3140db..6a4c79c7de 100644
--- a/kokoro/release/protoc/macos/build.sh
+++ b/kokoro/release/protoc/macos/build.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
-set -x
-CXXFLAGS_COMMON="-DNDEBUG -mmacosx-version-min=10.9"
+set -ex
+CXXFLAGS_COMMON="-std=c++14 -DNDEBUG -mmacosx-version-min=10.9"
 
 cd github/protobuf
 ./autogen.sh