diff --git a/.travis.yml b/.travis.yml
index 2d407fd..5f43e03 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,4 +8,5 @@ before_install:
   - go get -u github.com/golang/lint/golint
 
 before_script:
+  - '! gofmt -s -l . | read'
   - golint ./...
diff --git a/patricia.go b/patricia.go
index 718f951..56ec4e7 100644
--- a/patricia.go
+++ b/patricia.go
@@ -84,7 +84,7 @@ func splitPrefix(bss [][]byte) (prefix []byte, rest [][]byte) {
 	}
 
 	if len(bss) == 1 {
-		return bss[0], [][]byte{[]byte{}}
+		return bss[0], [][]byte{{}}
 	}
 
 	for i := 0; ; i++ {