diff --git a/mvwrap/mvwrap b/mvwrap/mvwrap
index 52b6807..ba6393c 100755
--- a/mvwrap/mvwrap
+++ b/mvwrap/mvwrap
@@ -87,6 +87,7 @@ sub open_temp {
 }
 
 sub read_temp {
+	my $target_name = shift;
 	open $target, $target_name or die "Couldn't open tempfile: $target_name: $!";
 	@target = <$target>;
 	close ($target);