diff --git a/contrib/completion/bash/docker b/contrib/completion/bash/docker
index 26823fce93..3aacd240f7 100644
--- a/contrib/completion/bash/docker
+++ b/contrib/completion/bash/docker
@@ -561,7 +561,7 @@ __docker_services() {
 		shift
 	fi
 
-  __docker_q service ls --quiet --format "$format" "$@"
+	__docker_q service ls --quiet --format "$format" "$@"
 }
 
 # __docker_complete_services applies completion of services based on the current