--- a/toolkit/crashreporter/tools/unit-symbolstore.py
+++ b/toolkit/crashreporter/tools/unit-symbolstore.py
@@ -532,13 +532,13 @@ class TestFunctional(HelperMixin, unitte
             for line in match_lines:
                 filename = line.split(None, 2)[2]
                 self.assertEqual('hg:', filename[:3])
         # Check that nsBrowserApp.cpp is listed as a FILE line, and that
         # it was properly mapped to the source repo.
         check_hg_path(file_lines, 'nsBrowserApp.cpp')
         # Also check Assertions.h to verify that files from dist/include
         # are properly mapped.
-        check_hg_path(file_lines, 'mfbt/Assertions.h')
+        check_hg_path(file_lines, 'mfbt/Sprintf.h')
 
 
 if __name__ == '__main__':
     mozunit.main()