diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 156b77f..01ee9e6 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -16,7 +16,7 @@ jobs:
     - name: Set up Go 1.x
       uses: actions/setup-go@v2
       with:
-        go-version: ^1.13
+        go-version: ^1.14
       id: go
 
     - name: Check out code into the Go module directory
diff --git a/stun/const.go b/stun/const.go
index e1faa9f..5e2e52f 100644
--- a/stun/const.go
+++ b/stun/const.go
@@ -86,10 +86,10 @@ func init() {
 
 	// Defined in RFC 3489
 	natNormalTypeStr = map[NATBehavior]string{
-		NATBehavior{BehaviorTypeEndpoint, BehaviorTypeEndpoint}:       "Full cone NAT",
-		NATBehavior{BehaviorTypeEndpoint, BehaviorTypeAddr}:           "Restricted cone NAT",
-		NATBehavior{BehaviorTypeEndpoint, BehaviorTypeAddrAndPort}:    "Port Restricted cone NAT",
-		NATBehavior{BehaviorTypeAddrAndPort, BehaviorTypeAddrAndPort}: "Symmetric NAT",
+		{BehaviorTypeEndpoint, BehaviorTypeEndpoint}:       "Full cone NAT",
+		{BehaviorTypeEndpoint, BehaviorTypeAddr}:           "Restricted cone NAT",
+		{BehaviorTypeEndpoint, BehaviorTypeAddrAndPort}:    "Port Restricted cone NAT",
+		{BehaviorTypeAddrAndPort, BehaviorTypeAddrAndPort}: "Symmetric NAT",
 	}
 }