diff --git a/rtl/x86_fpdbgdisas.pp b/rtl/x86_fpdbgdisas.pp
index 20b1596c..8cafae8a 100644
--- a/rtl/x86_fpdbgdisas.pp
+++ b/rtl/x86_fpdbgdisas.pp
@@ -1561,9 +1561,12 @@ end;
 
 procedure TX86Disassembler.AddIz;
 begin
-  if OperandSize = os16
-  then AddOperand(RegValue(regNone), os16, 2, [hvfIncludeHexchar])
-  else AddOperand(RegValue(regNone), os32, 4, [hvfIncludeHexchar]);
+ case OperandSize of
+   os16:AddOperand(RegValue(regNone), os16, 2, [hvfIncludeHexchar]);
+   os64:AddOperand(RegValue(regNone), os32, 4, [hvfSigned, hvfIncludeHexchar]);
+   else
+        AddOperand(RegValue(regNone), os32, 4, [hvfIncludeHexchar]);
+ end;
 end;
 
 procedure TX86Disassembler.AddJb;
@@ -2739,7 +2742,7 @@ end;
 
 procedure TX86Disassembler.DoGroup14;
 const
-  OPC: array[0..7] of TOpCode       = (OPX_Invalid, OPX_Invalid, OPpsrl, OPpsll,  OPX_Invalid, OPX_Invalid, OPpsll, OPpsrl);
+  OPC: array[0..7] of TOpCode       = (OPX_Invalid, OPX_Invalid, OPpsrl, OPpsrl,  OPX_Invalid, OPX_Invalid, OPpsll, OPpsll);
   OPS: array[0..7] of TOpCodeSuffix = (OPSnone,     OPSnone,     OPSx_q, OPSx_dq, OPSnone,     OPSnone,     OPSx_q, OPSx_dq);
 begin
   Assert(Code[CodeIdx] = $73, 'Not group 14');