diff --git a/codec_go16_test.go b/codec_go16_test.go
deleted file mode 100644
index 62cb144..0000000
--- a/codec_go16_test.go
+++ /dev/null
@@ -1,13 +0,0 @@
-// +build go1.16
-
-package json
-
-import (
-	"testing"
-)
-
-func TestTypeAddressAligned32(t *testing.T) {
-	if typeAddrShift != 5 {
-		t.Fatalf("unexpected type address shift %d, want 5", typeAddrShift)
-	}
-}