diff --git a/Zend/acinclude.m4 b/Zend/acinclude.m4
index aa78edc7c67..d5bae3769c8 100644
--- a/Zend/acinclude.m4
+++ b/Zend/acinclude.m4
@@ -6,7 +6,7 @@ AC_DEFUN([LIBZEND_BISON_CHECK],[
   # we only support certain bison versions
   bison_version_list="1.28 1.35 1.75 2.0"
 
-  if test "$YACC" = "bison -y"; then
+  if test "$YACC"; then
     AC_CACHE_CHECK([for bison version], php_cv_bison_version, [
       set `bison --version| grep 'GNU Bison' | cut -d ' ' -f 4 | $SED -e 's/\./ /'|tr -d a-z`
       bison_version="${1}.${2}"