diff --git a/lib/CPUs/MIPS/src/core/mips_types.vhd b/lib/CPUs/MIPS/src/core/mips_types.vhd
index d861c41..9f6edb8 100644
--- a/lib/CPUs/MIPS/src/core/mips_types.vhd
+++ b/lib/CPUs/MIPS/src/core/mips_types.vhd
@@ -585,6 +585,9 @@ package body mips_types is
 		elsif word2_en = '1' then
 			sign	:= signed and x(15);
 			result := (31 downto 16 => sign) & x(15 downto 0);
+		elsif word4_en = '1' then
+			sign	:= signed and x(7);
+			result := (31 downto 8 => sign) & x(7 downto 0);
 		else
 			sign	:= signed and x(7);
 			result := (31 downto 8 => sign) & x(7 downto 0);