diff --git a/qa/workunits/rbd/rbd_mirror_helpers.sh b/qa/workunits/rbd/rbd_mirror_helpers.sh
index 39db271e03f..1e086eee322 100755
--- a/qa/workunits/rbd/rbd_mirror_helpers.sh
+++ b/qa/workunits/rbd/rbd_mirror_helpers.sh
@@ -880,7 +880,7 @@ request_resync_image()
     local cluster=$1
     local pool=$2
     local image=$3
-    local image_id_var_name=$1
+    local image_id_var_name=$4
 
     eval "${image_id_var_name}='$(get_image_id ${cluster} ${pool} ${image})'"
     eval 'test -n "$'${image_id_var_name}'"'