diff --git a/github/github_test.go b/github/github_test.go
index 521f12a..d404a00 100644
--- a/github/github_test.go
+++ b/github/github_test.go
@@ -198,7 +198,7 @@ func TestNewRequest_invalidJSON(t *testing.T) {
 	c := NewClient(nil)
 
 	type T struct {
-		A map[int]interface{}
+		A map[interface{}]interface{}
 	}
 	_, err := c.NewRequest("GET", "/", &T{})