diff --git a/src/mame/drivers/at.cpp b/src/mame/drivers/at.cpp
index 1df9cae9efd..93012988f69 100644
--- a/src/mame/drivers/at.cpp
+++ b/src/mame/drivers/at.cpp
@@ -1176,7 +1176,7 @@ ROM_END
 // Amstrad MegaPC
 ROM_START( megapc )
 	ROM_REGION(0x40000, "isa", ROMREGION_ERASEFF)
-	ROM_REGION16_LE(0x20000, "bios", 0)
+	ROM_REGION(0x20000, "bios", 0)
 	ROM_LOAD16_BYTE( "41651-bios lo.u18",  0x00000, 0x10000, CRC(1e9bd3b7) SHA1(14fd39ec12df7fae99ccdb0484ee097d93bf8d95))
 	ROM_LOAD16_BYTE( "211253-bios hi.u19", 0x00001, 0x10000, CRC(6acb573f) SHA1(376d483db2bd1c775d46424e1176b24779591525))
 ROM_END
@@ -1184,7 +1184,7 @@ ROM_END
 // Amstrad MegaPC Plus
 ROM_START( megapcpl )
 	ROM_REGION(0x40000, "isa", ROMREGION_ERASEFF)
-	ROM_REGION32_LE(0x20000, "bios", 0)
+	ROM_REGION(0x20000, "bios", 0)
 	ROM_LOAD16_BYTE( "41652.u18",  0x00000, 0x10000, CRC(6f5b9a1c) SHA1(cae981a35a01234fcec99a96cb38075d7bf23474))
 	ROM_LOAD16_BYTE( "486slc.u19", 0x00001, 0x10000, CRC(6fb7e3e9) SHA1(c439cb5a0d83176ceb2a3555e295dc1f84d85103))
 ROM_END