diff --git a/scripts/promote-image.sh b/scripts/promote-image.sh
index b79f877..51537e9 100755
--- a/scripts/promote-image.sh
+++ b/scripts/promote-image.sh
@@ -81,7 +81,7 @@ while (( iter )); do
     echo "Error deleting tag:" >&2
     echo "${RESULTS}" >&2
     iter=$((iter-1))
-    if (( ! iter ))
+    if (( ! iter )); then
       fail "No more tries."
     fi
     echo "Waiting 10s before trying again..."
@@ -97,7 +97,7 @@ while (( iter )); do
   fi
   echo "Unable to push ${CONTAINER}:${TARGET_TAG}" >&2
   iter=$((iter-1))
-  if (( ! iter ))
+  if (( ! iter )); then
     fail "No more tries."
   fi
   echo "Waiting 10s before trying again..."
@@ -112,7 +112,7 @@ while (( iter )); do
   fi
   fail "Unable to push ${CONTAINER}:latest-${TARGET_TAG}"
   iter=$((iter-1))
-  if (( ! iter ))
+  if (( ! iter )); then
     fail "No more tries."
   fi
   echo "Waiting 10s before trying again..."