diff --git a/hack/release.sh b/hack/release.sh
index eb1c886342..fbbcde52bc 100755
--- a/hack/release.sh
+++ b/hack/release.sh
@@ -303,7 +303,7 @@ release_index() {
 }
 
 main() {
-	[[ "$SKIP_RELEASE_BUILD" -eq 1 ]] || build_all
+	[ "$SKIP_RELEASE_BUILD" = '1' ] || build_all
 	setup_s3
 	release_binaries
 	release_index