diff --git a/src/emu/bus/msx_slot/cartridge.c b/src/emu/bus/msx_slot/cartridge.c
index d6ddbe5bda8..a7d79be1a51 100644
--- a/src/emu/bus/msx_slot/cartridge.c
+++ b/src/emu/bus/msx_slot/cartridge.c
@@ -328,6 +328,7 @@ void msx_slot_cartridge_device::get_default_card_software(std::string &result)
 		if (type == NOMAPPER)
 		{
 			// Not identified through hashfile, try automatic detection
+			core_fread(m_file, &rom[0], length);
 			type = get_cart_type(&rom[0], length);
 		}