diff --git a/src/arch/x86/insts/microregop.cc b/src/arch/x86/insts/microregop.cc
index 2edd3ba87c..5982dff7af 100644
--- a/src/arch/x86/insts/microregop.cc
+++ b/src/arch/x86/insts/microregop.cc
@@ -78,7 +78,7 @@ namespace X86ISA
             if(subtract)
                 flags ^= (flagMask & (ECFBit | CFBit));
         }
-        if(flagMask & PFBit && findParity(dataSize*8, _dest))
+        if(flagMask & PFBit && !findParity(8, _dest))
             flags |= PFBit;
         if(flagMask & AFBit)
         {