diff --git a/LR35902/src/GameBoyBus.cpp b/LR35902/src/GameBoyBus.cpp
index e039a14..11b66c9 100644
--- a/LR35902/src/GameBoyBus.cpp
+++ b/LR35902/src/GameBoyBus.cpp
@@ -114,7 +114,7 @@ void EightBit::GameBoy::Bus::validateCartridgeType() {
 		default:
 			if (romSizeSpecification > 6)
 				throw std::domain_error("Invalid ROM size specification");
-			gameRomBanks = 1i64 << (romSizeSpecification + 1);
+			gameRomBanks = 1 << (romSizeSpecification + 1);
 			if (gameRomBanks != m_gameRomBanks.size())
 				throw std::domain_error("ROM size specification mismatch");
 		}