diff --git a/src/test/perl/PostgresVersion.pm b/src/test/perl/PostgresVersion.pm
index 7ce9e62b798..55984ec7e81 100644
--- a/src/test/perl/PostgresVersion.pm
+++ b/src/test/perl/PostgresVersion.pm
@@ -110,10 +110,12 @@ sub new
 #
 sub _version_cmp
 {
-	my ($a, $b) = @_;
+	my ($a, $b, $swapped) = @_;
 
 	$b = __PACKAGE__->new($b) unless blessed($b);
 
+	($a, $b) = ($b, $a) if $swapped;
+
 	my ($an, $bn) = ($a->{num}, $b->{num});
 
 	for (my $idx = 0;; $idx++)