diff --git a/mysql-test/dgcov.pl b/mysql-test/dgcov.pl
index 734f5c6ed7d..2c00c64d1ff 100755
--- a/mysql-test/dgcov.pl
+++ b/mysql-test/dgcov.pl
@@ -171,7 +171,7 @@ sub gcov_one_file {
         next;
       }
       if (/^file:/) {
-        $fname=realpath($');
+        $fname=realpath(-f $' ? $' : $root.$');
         next;
       }
       next if /^lcount:\d+,-\d+/; # whatever that means