diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 602dfa799bf..17bdbd93c4b 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -8465,7 +8465,7 @@
 			(zero_extend:<DWI> (match_dup 3)))
 	    (match_operand:QI 4 "const_int_operand" "n"))))]
   "TARGET_BMI2 && INTVAL (operands[4]) == <MODE_SIZE> * BITS_PER_UNIT
-   && !(MEM_P (operands[1]) && MEM_P (operands[2]))"
+   && !(MEM_P (operands[2]) && MEM_P (operands[3]))"
   "mulx\t{%3, %0, %1|%1, %0, %3}"
   [(set_attr "type" "imulx")
    (set_attr "prefix" "vex")