diff --git a/contrib/completion/bash/docker b/contrib/completion/bash/docker
index 87877b0f..9051cb5c 100644
--- a/contrib/completion/bash/docker
+++ b/contrib/completion/bash/docker
@@ -1031,7 +1031,17 @@ _docker_container_create() {
 }
 
 _docker_container_diff() {
-	_docker_diff
+	case "$cur" in
+		-*)
+			COMPREPLY=( $( compgen -W "--help" -- "$cur" ) )
+			;;
+		*)
+			local counter=$(__docker_pos_first_nonflag)
+			if [ $cword -eq $counter ]; then
+				__docker_complete_containers_all
+			fi
+			;;
+	esac
 }
 
 _docker_container_exec() {
@@ -1317,17 +1327,7 @@ _docker_daemon() {
 }
 
 _docker_diff() {
-	case "$cur" in
-		-*)
-			COMPREPLY=( $( compgen -W "--help" -- "$cur" ) )
-			;;
-		*)
-			local counter=$(__docker_pos_first_nonflag)
-			if [ $cword -eq $counter ]; then
-				__docker_complete_containers_all
-			fi
-			;;
-	esac
+	_docker_container_diff
 }
 
 _docker_events() {