diff --git a/test/no-lang-line-source.rkt b/test/no-lang-line-source.txt
similarity index 100%
rename from test/no-lang-line-source.rkt
rename to test/no-lang-line-source.txt
diff --git a/test/tests.rkt b/test/tests.rkt
index 2de656e..e4effef 100644
--- a/test/tests.rkt
+++ b/test/tests.rkt
@@ -197,7 +197,7 @@
 
 (module no-lang-line-include-test racket/base
   (require sugar/include)
-  (include-without-lang-line "no-lang-line-source.rkt")
+  (include-without-lang-line "no-lang-line-source.txt")
   (provide no-lang-symbol))
 
 (require 'no-lang-line-include-test)