diff --git a/grpc/build_grpc.sh b/grpc/build_grpc.sh
index 8fb9e1c..3c0c27e 100755
--- a/grpc/build_grpc.sh
+++ b/grpc/build_grpc.sh
@@ -5,7 +5,7 @@
 function build_grpc () {
   git clone https://github.com/grpc/grpc.git google/grpc
   cd google/grpc
-  git checkout ${grpc_1_15_1_githash} 
+  git checkout ${grpc_1_15_1_githash}
   git submodule update --init
   make
   make install prefix=`pwd`/install