diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 9390dd5be88..8e847520491 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -10843,7 +10843,7 @@
    (set (match_dup 0)
 	(not:SWI248 (match_dup 0)))]
 {
-  if (MASK_REGNO_P (REGNO (operands[0])))
+  if (MASK_REG_P (operands[0]))
     {
       emit_insn (gen_kxnor<mode> (operands[0], operands[1], operands[2]));
       DONE;