diff --git a/hack/make/test-integration b/hack/make/test-integration
index fa8b8be719..a60efebfc3 100644
--- a/hack/make/test-integration
+++ b/hack/make/test-integration
@@ -12,5 +12,5 @@ bundle_test_integration() {
 # this "grep" hides some really irritating warnings that "go test -coverpkg"
 # spews when it is given packages that aren't used
 bundle_test_integration 2>&1 \
-	| grep -v '^warning: no packages being tested depend on ' \
+	| grep --line-buffered -v '^warning: no packages being tested depend on ' \
 	| tee $DEST/test.log