diff --git a/test/test_phyx.js b/test/test_phyx.js
index 051263f..b32f83f 100644
--- a/test/test_phyx.js
+++ b/test/test_phyx.js
@@ -80,7 +80,7 @@ describe('Test PHYX files in repository', function() {
 
               // Let's write the JSON-LD into a file for debugging.
               fs.writeFileSync(
-                filename.replace('paper.json', 'paper_as_owl.json'),
+                filename.replace(/.json$/, '_as_owl.json'),
                 jsonld
               );
             } catch(ex) {