diff --git a/tests/badsymbols.pl b/tests/badsymbols.pl
index d9766cad71..2ef803aafc 100755
--- a/tests/badsymbols.pl
+++ b/tests/badsymbols.pl
@@ -132,7 +132,7 @@ sub scanheader {
 }
 
 
-opendir(my $dh, $incdir) || die "Can't opendir: $!";
+opendir(my $dh, $incdir) || die "Can't opendir $incdir: $!";
 my @hfiles = grep { /\.h$/ } readdir($dh);
 closedir $dh;