diff --git a/scripts/gitea-actions/repair_runner_mirror.xsh b/scripts/gitea-actions/repair_runner_mirror.xsh
index 291dc10..39c4cad 100755
--- a/scripts/gitea-actions/repair_runner_mirror.xsh
+++ b/scripts/gitea-actions/repair_runner_mirror.xsh
@@ -54,7 +54,7 @@ for label, source_image, mirror_image in mirror_pairs:
         continue
 
     # Validate mirror pullability with this host's Docker registry config.
-    $(docker image rm @(mirror_image) > /dev/null 2> /dev/null || true)
+    rm_image = !(docker image rm @(mirror_image) > /dev/null 2>&1)
     verify = !(docker pull @(mirror_image) > @(mirror_verify_log) 2>&1)
     if verify.returncode == 0:
         print(f"{label}_MIRROR_PULL:ok")