diff --git a/gcc/config/i386/i386-protos.h b/gcc/config/i386/i386-protos.h
index fef5c52cfba..2651f4bbd03 100644
--- a/gcc/config/i386/i386-protos.h
+++ b/gcc/config/i386/i386-protos.h
@@ -56,6 +56,7 @@ extern int general_no_elim_operand PARAMS ((rtx, enum machine_mode));
 extern int nonmemory_no_elim_operand PARAMS ((rtx, enum machine_mode));
 extern int q_regs_operand PARAMS ((rtx, enum machine_mode));
 extern int non_q_regs_operand PARAMS ((rtx, enum machine_mode));
+extern int no_comparison_operator PARAMS ((rtx, enum machine_mode));
 extern int sse_comparison_operator PARAMS ((rtx, enum machine_mode));
 extern int fcmov_comparison_operator PARAMS ((rtx, enum machine_mode));
 extern int cmp_fp_expander_operand PARAMS ((rtx, enum machine_mode));