diff --git a/tests/data/unsupported-extension.xxx b/tests/data/unsupported-extension.xx
similarity index 100%
rename from tests/data/unsupported-extension.xxx
rename to tests/data/unsupported-extension.xx
diff --git a/tests/test_fileref.cpp b/tests/test_fileref.cpp
index 2d77682a..1b899975 100644
--- a/tests/test_fileref.cpp
+++ b/tests/test_fileref.cpp
@@ -233,7 +233,7 @@ public:
     FileRef f1(TEST_FILE_PATH_C("no-extension"));
     CPPUNIT_ASSERT(f1.isNull());
 
-    FileRef f2(TEST_FILE_PATH_C("unsupported-extension.xxx"));
+    FileRef f2(TEST_FILE_PATH_C("unsupported-extension.xx"));
     CPPUNIT_ASSERT(f2.isNull());
   }