diff --git a/grammar_test/preprocessor.txt b/grammar_test/preprocessor.txt
index 96d035a..401653c 100644
--- a/grammar_test/preprocessor.txt
+++ b/grammar_test/preprocessor.txt
@@ -21,12 +21,14 @@ Object-like macro definitions
   c == d ? \
   e : \
   f
+#define FOUR mno
 
 ---
 
 (translation_unit
   (preproc_def (identifier))
   (preproc_def (identifier) (preproc_arg))
+  (preproc_def (identifier) (preproc_arg))
   (preproc_def (identifier) (preproc_arg)))
 
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