diff --git a/Core/UnRom512.h b/Core/UnRom512.h
index c46ab57c..8f6efd19 100644
--- a/Core/UnRom512.h
+++ b/Core/UnRom512.h
@@ -22,8 +22,8 @@ protected:
 
 		_enableMirroringBit = false;
 		switch(_romInfo.NesHeader.Byte6 & 0x09) {
-			case 0: SetMirroringType(MirroringType::Vertical); break;
-			case 1: SetMirroringType(MirroringType::Horizontal); break;
+			case 0: SetMirroringType(MirroringType::Horizontal); break;
+			case 1: SetMirroringType(MirroringType::Vertical); break;
 			case 8: SetMirroringType(MirroringType::ScreenAOnly); _enableMirroringBit = true; break;
 			case 9: SetMirroringType(MirroringType::FourScreens); break;
 		}