diff --git a/src/arch/x86/insts/microregop.cc b/src/arch/x86/insts/microregop.cc
index 080926627..2ea975746 100644
--- a/src/arch/x86/insts/microregop.cc
+++ b/src/arch/x86/insts/microregop.cc
@@ -67,6 +67,9 @@ namespace X86ISA
             bool subtract) const
     {
         DPRINTF(X86, "flagMask = %#x\n", flagMask);
+        if (_destRegIdx[0] & (1 << 6)) {
+            _dest >>= 8;
+        }
         uint64_t flags = oldFlags & ~flagMask;
         if(flagMask & (ECFBit | CFBit))
         {