diff --git a/12-say-grpc/backend/Makefile b/12-say-grpc/backend/Makefile
index 6d7c0568..01998078 100644
--- a/12-say-grpc/backend/Makefile
+++ b/12-say-grpc/backend/Makefile
@@ -12,7 +12,7 @@
 # limitations under the License.
 
 build:
-	GOOS=linux go build -o app
+	GOOS=linux CGO_ENABLED=0 go build -o app
 	docker build -t gcr.io/justforfunc-prep/say .
 	rm -f app