diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 54b1dc40644..7073b251b80 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -1085,7 +1085,7 @@
   "*
 {
   if (REGNO (operands[0]) == 0)
-    return \"clq\";
+    return \"cwtl\";
 
   operands[1] = gen_rtx (REG, SImode, REGNO (operands[0]) + 1);
   output_asm_insn (AS2 (mov%L0,%0,%1), operands);