diff --git a/parser/parserules.py b/parser/parserules.py
index b75c8d6..3c318f8 100644
--- a/parser/parserules.py
+++ b/parser/parserules.py
@@ -1,2 +1,6 @@
 
 from lexrules import tokens
+
+def p_c_expr(p):
+    'c_expr : C LPAREN STRING RPAREN SEMICOLON'
+    p[0] = 'success'