diff --git a/lib/soft386/common.inl b/lib/soft386/common.inl
index 170ef61ec23..7a218d82d2a 100644
--- a/lib/soft386/common.inl
+++ b/lib/soft386/common.inl
@@ -436,10 +436,7 @@ FORCEINLINE
 BOOLEAN
 Soft386CalculateParity(UCHAR Number)
 {
-    Number ^= Number >> 1;
-    Number ^= Number >> 2;
-    Number ^= Number >> 4;
-    return !(Number & 1);
+    return (0x9669 >> ((Number & 0x0F) ^ (Number >> 4))) & 1;
 }
 
 FORCEINLINE