diff --git a/grammar_parser/parser.inc b/grammar_parser/parser.inc
index 259ee1c..980c402 100644
--- a/grammar_parser/parser.inc
+++ b/grammar_parser/parser.inc
@@ -409,7 +409,7 @@ class PGPParser {
    *
    * @see set_exception_handler
    */
-  protected function exceptionHandler($exception) {
+  public function exceptionHandler($exception) {
     $backtrace = $exception->getTrace();
     // Push on top of the backtrace the call that generated the exception.
     array_unshift($backtrace, array(