diff --git a/src/devices/cpu/tms57002/tms57002.cpp b/src/devices/cpu/tms57002/tms57002.cpp
index 93f8a3e7924..2424642e8d4 100644
--- a/src/devices/cpu/tms57002/tms57002.cpp
+++ b/src/devices/cpu/tms57002/tms57002.cpp
@@ -17,7 +17,7 @@ const device_type TMS57002 = &device_creator<tms57002_device>;
 
 // Can't use a DEVICE_ADDRESS_MAP, not yet anyway
 static ADDRESS_MAP_START(internal_pgm, AS_PROGRAM, 32, tms57002_device)
-	AM_RANGE(0x000, 0x3ff) AM_RAM
+	AM_RANGE(0x00, 0xff) AM_RAM
 ADDRESS_MAP_END
 
 tms57002_device::tms57002_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)