diff --git a/release.sh b/release.sh
index 450c067..a378a5f 100755
--- a/release.sh
+++ b/release.sh
@@ -75,7 +75,7 @@ RELEASE_NOTES=""
 RELEASE_BRANCH=""
 RELEASE_GCS_BUCKET="knative-nightly/${REPO_NAME}"
 RELEASE_DIR=""
-KO_FLAGS="-P --platform=all"
+export KO_FLAGS="-P --platform=all"
 VALIDATION_TESTS="./test/presubmit-tests.sh"
 ARTIFACTS_TO_PUBLISH=""
 FROM_NIGHTLY_RELEASE=""