diff --git a/src/spider/runtime/instr/Instr_000-01F.cpp b/src/spider/runtime/instr/Instr_000-01F.cpp
index 32d657b..8db5e62 100644
--- a/src/spider/runtime/instr/Instr_000-01F.cpp
+++ b/src/spider/runtime/instr/Instr_000-01F.cpp
@@ -373,10 +373,10 @@ namespace spider {
         fetchOperDst();
         switch(_size){
             case 0b00: //byte
-                RF = (RF & ~(u32(0x3) << 9)) | ((_dst->_u8 >> 9) & 0x3) << 9;
+                RF = (RF & ~(u8(0x3) << 9)) | ((_dst->_u8 >> 9) & 0x3) << 9;
                 break;
             case 0b01: //short
-                RF = (RF & ~(u32(0x3) << 9)) | ((_dst->_u16 >> 9) & 0x3) << 9;
+                RF = (RF & ~(u16(0x3) << 9)) | ((_dst->_u16 >> 9) & 0x3) << 9;
                 break;
             case 0b10: //int
                 RF = (RF & ~(u32(0x3) << 9)) | ((_dst->_u32 >> 9) & 0x3) << 9;