diff --git a/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-dyngen-ops.cpp b/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-dyngen-ops.cpp
index 9ea30a28..661a9fbf 100644
--- a/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-dyngen-ops.cpp
+++ b/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-dyngen-ops.cpp
@@ -666,12 +666,16 @@ void OPPROTO op_mullwo_T0_T1(void)
 
 void OPPROTO op_slw_T0_T1(void)
 {
-	T0 = T0 << (T1 & 0x3f);
+	T1 &= 0x3f;
+	T0 = (T1 & 0x20) ? 0 : (T0 << T1);
+	dyngen_barrier();
 }
 
 void OPPROTO op_srw_T0_T1(void)
 {
-	T0 = T0 >> (T1 & 0x3f);
+	T1 &= 0x3f;
+	T0 = (T1 & 0x20) ? 0 : (T0 >> T1);
+	dyngen_barrier();
 }
 
 void OPPROTO op_sraw_T0_T1(void)