diff --git a/container.go b/container.go
index 6cf35ec70e..419ba84d29 100644
--- a/container.go
+++ b/container.go
@@ -133,7 +133,11 @@ type PortBinding struct {
 type Port string
 
 func (p Port) Proto() string {
-	return strings.Split(string(p), "/")[1]
+	parts := strings.Split(string(p), "/")
+	if len(parts) == 1 {
+		return "tcp"
+	}
+	return parts[1]
 }
 
 func (p Port) Port() string {