diff --git a/src/mbc.cpp b/src/mbc.cpp
index 3fd40e9..fd47057 100644
--- a/src/mbc.cpp
+++ b/src/mbc.cpp
@@ -51,8 +51,7 @@ Byte *AddressSpace::MBCRead(const Word address) {
       return &twoBitBankRegister;
     if (address <= 0x7FFF)
       return &romRamSelect;
-  }
-  if (MBC == MBC1Ram || MBC == MBC1RamBattery) {
+  } else if (MBC == MBC1Ram || MBC == MBC1RamBattery) {
     if (address <= 0x1FFF)
       return &ramEnable;
     // bits 0-4
@@ -63,14 +62,16 @@ Byte *AddressSpace::MBCRead(const Word address) {
     }
     if (address <= 0x7FFF)
       return &romRamSelect;
-  }
-  if (MBC == MBC2 || MBC == MBC2Battery) {
+  } else if (MBC == MBC2 || MBC == MBC2Battery) {
     if (address <= 0x3FFF) {
       if (address & 0x0100)
         return &romBankRegister;
       else
         return &ramEnable;
     }
+  } else if (MBC == MBC3 || MBC == MBC3TimerBattery) {
+  } else if (MBC == MBC3Ram || MBC == MBC3RamBattery ||
+             MBC == MBC3TimerRamBattery) {
   }
   return &dummyVal;
 }