diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 83e36b5..8b5a74a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -29,7 +29,7 @@ jobs:
         for image in "${image_array[@]}"; do
           for platform in "${platform_array[@]}"; do
             docker pull "${image}" --platform "${platform}"
-            docker save "${image}" -o "${image//\//_}-${platform}.tar"
+            docker save "${image}" -o "$(echo "${image//[:\/]/_}-${platform}.tar")"
           done
         done