diff --git a/codecs/av1/obu/leb128_test.go b/codecs/av1/obu/leb128_test.go
index aded8ca..7be26ff 100644
--- a/codecs/av1/obu/leb128_test.go
+++ b/codecs/av1/obu/leb128_test.go
@@ -59,7 +59,8 @@ func TestWriteToLeb128(t *testing.T) {
 		{0, "00"},
 		{math.MaxUint32, "ffffffff0f"},
 	}
-	if math.MaxInt64 == int(^uint(0)>>1) {
+	if math.MaxInt32 != ^uint(0) {
+		// 64-bit platform
 		testVectors = append(testVectors, testVector{math.MaxUint64, "ffffffffffffffffff01"})
 	}