diff --git a/lib/CPUs/MIPS/src/core/mips_cop.vhd b/lib/CPUs/MIPS/src/core/mips_cop.vhd
index d1c5e66..350aab3 100644
--- a/lib/CPUs/MIPS/src/core/mips_cop.vhd
+++ b/lib/CPUs/MIPS/src/core/mips_cop.vhd
@@ -338,7 +338,7 @@ cop_register_read:
 				reg	:= test_reg;
 
 			when others =>
-				reg	:= X"DEADBEEF";
+				reg	:= (others => '-');
 
 			end case;	
 			dout	<= reg;