diff --git a/crsn_arith/src/exec.rs b/crsn_arith/src/exec.rs
index ab2b4f1..64722e2 100644
--- a/crsn_arith/src/exec.rs
+++ b/crsn_arith/src/exec.rs
@@ -312,7 +312,7 @@ impl OpTrait for ArithOp {
                 let res = if 0 != (val & 0x8000_0000) {
                     0xFFFF_FFFF_0000_0000 | val
                 } else {
-                    val
+                    val & 0xFFFF_FFFF
                 };
                 state.update_status(res);
                 state.write(dst, res)?;
@@ -323,7 +323,7 @@ impl OpTrait for ArithOp {
                 let res = if 0 != (val & 0x8000) {
                     0xFFFF_FFFF_FFFF_0000 | val
                 } else {
-                    val
+                    val & 0xFFFF
                 };
                 state.update_status(res);
                 state.write(dst, res)?;
@@ -334,7 +334,7 @@ impl OpTrait for ArithOp {
                 let res = if 0 != (val & 0x80) {
                     0xFFFF_FFFF_FFFF_FF00 | val
                 } else {
-                    val
+                    val & 0xFF
                 };
                 state.update_status(res);
                 state.write(dst, res)?;