diff --git a/tool/test-runner.pl b/tool/test-runner.pl
index 1516ee0..c23dcae 100755
--- a/tool/test-runner.pl
+++ b/tool/test-runner.pl
@@ -36,6 +36,7 @@ my $ctx = {
 print "TAP Version 13\n";
 $parsed->($ctx);
 
+die "No tests" unless $plan > 0;
 print "1..$plan\n";
 
 exit 0;