diff --git a/tool/build_image_proxy.yaml b/tool/build_image_proxy.yaml
index 512062b83..23c3b6eac 100644
--- a/tool/build_image_proxy.yaml
+++ b/tool/build_image_proxy.yaml
@@ -16,7 +16,7 @@ steps:
         echo 'Only deploy from the dartlang-pub project'
         exit 1;
       fi
-      if [[ ! "$TAG_NAME" =~ ^image_proxy-.*$ ]]; then
+      if [[ ! "$TAG_NAME" =~ ^image-proxy-.*$ ]]; then
         echo 'This script is only intended for use on image_proxy-<version> tags'
         echo 'Current tag': $TAG_NAME
         exit 1;