diff --git a/tools/run_tests/build_php.sh b/tools/run_tests/build_php.sh
index 2d52a6e33b458ce521d911ab76d692ee00609a1e..1d81779b6acd84a969bd14b9d5fe4f1c93374d5e 100755
--- a/tools/run_tests/build_php.sh
+++ b/tools/run_tests/build_php.sh
@@ -37,6 +37,7 @@ cd $(dirname $0)/../..
 
 root=`pwd`
 export GRPC_LIB_SUBDIR=libs/$CONFIG
+export CFLAGS="-Wno-parentheses-equality"
 
 # build php
 cd src/php