diff --git a/render/filters.go b/render/filters.go
index 7cabda72e..9be24ede4 100644
--- a/render/filters.go
+++ b/render/filters.go
@@ -259,7 +259,7 @@ var systemContainerNames = map[string]struct{}{
 }
 
 var systemImagePrefixes = map[string]struct{}{
-	"/swarm":                              {},
+	"swarm":                               {},
 	"weaveworks/scope":                    {},
 	"weaveworks/weavedns":                 {},
 	"weaveworks/weave":                    {},