diff --git a/examples/test-unused-rules-reporting.jison b/examples/test-unused-rules-reporting.jison
index ff76ace40..051d3750b 100644
--- a/examples/test-unused-rules-reporting.jison
+++ b/examples/test-unused-rules-reporting.jison
@@ -38,14 +38,17 @@ expressions
 
 unused_rule_1
     : epsilon WORD WORD
+        { $$ = $1 + $2 + $3; }
     ;
 
 unused_rule_2
     : expressions WORD
+        { $$ = $1 + $2; }
     ;
 
 unused_rule_3
     : e WORD
+        { $$ = $1 + $2; }
     ;
 
 %%