diff --git a/bulls-and-cows-cpp/CGame.h b/bulls-and-cows-cpp/CGame.h
index 03c2c07..483237c 100644
--- a/bulls-and-cows-cpp/CGame.h
+++ b/bulls-and-cows-cpp/CGame.h
@@ -40,7 +40,7 @@ bool CGame::IsEqual(const T number, const N digit, int i)
 
 	while ((--i) >= 0)
 	{
-		if (digit == number.at(i)) result = true;
+		if (digit == number[i]) result = true;
 	}
 	return result;
 }