diff --git a/compiler/cpp/src/thriftl.ll b/compiler/cpp/src/thriftl.ll
index fbad955..baaef5c 100644
--- a/compiler/cpp/src/thriftl.ll
+++ b/compiler/cpp/src/thriftl.ll
@@ -71,6 +71,7 @@
 "cpp_include"    { return tok_cpp_include;    }
 "cpp_type"       { return tok_cpp_type;       }
 "java_package"   { return tok_java_package;   }
+"cocoa_prefix"   { return tok_cocoa_prefix;   }
 "php_namespace"  { return tok_php_namespace;  }
 "py_module"      { return tok_py_module;      }
 "perl_package"   { return tok_perl_package;   }