diff --git a/autoconf/AutoRegen.sh b/autoconf/AutoRegen.sh
index efedd1a143e..40bd96be5f9 100755
--- a/autoconf/AutoRegen.sh
+++ b/autoconf/AutoRegen.sh
@@ -7,7 +7,8 @@ test -d autoconf && test -f autoconf/configure.ac && cd autoconf
 [ -f configure.ac ] || die "Can't find 'autoconf' dir; please cd into it first"
 echo "Regenerating aclocal.m4 with aclocal"
 aclocal || die "aclocal failed"
-if ! autoconf --version | egrep '2\.5[0-9]' > /dev/null
+autoconf --version | egrep '2\.5[0-9]' > /dev/null
+if test $? -ne 0
 then
 	die "Your autoconf was not detected as being 2.5x"
 fi