diff --git a/llvm/autoconf/m4/bison.m4 b/llvm/autoconf/m4/bison.m4
index 45add1127862..b077d1feed1d 100644
--- a/llvm/autoconf/m4/bison.m4
+++ b/llvm/autoconf/m4/bison.m4
@@ -6,7 +6,7 @@
 # 2) BISON is set to bison
 #
 AC_DEFUN([AC_PROG_BISON],
-[AC_CACHE_CHECK([if we have bison],[llvm_cv_has_bison],
+[AC_CACHE_CHECK([],[llvm_cv_has_bison],
 [AC_PROG_YACC()
 ])
 if test "$YACC" != "bison -y"; then