diff --git a/mapper_test.go b/mapper_test.go
index 5803fb7..3605e3d 100644
--- a/mapper_test.go
+++ b/mapper_test.go
@@ -310,7 +310,7 @@ mappings:
 		{
 			config: `---
 mappings:
-- match: "*\.foo"
+- match: "*\\.foo"
   match_type: regex
   name: "foo"
   labels: {}