diff --git a/src/burn/drv/pre90s/d_megasys1.cpp b/src/burn/drv/pre90s/d_megasys1.cpp
index 5c8344f55..df63013ae 100644
--- a/src/burn/drv/pre90s/d_megasys1.cpp
+++ b/src/burn/drv/pre90s/d_megasys1.cpp
@@ -58,7 +58,7 @@ static UINT8 oki_bank;
 static UINT16 soundlatch;
 static UINT16 soundlatch2;
 
-static UINT16 mcu_ram[6];
+static UINT16 mcu_ram[0x10];
 static INT32  mcu_hs = 0;
 static UINT16 *mcu_config;
 static UINT32 mcu_write_address;