diff --git a/SAX/helpers/XMLFilterImpl.h b/SAX/helpers/XMLFilterImpl.h
index f8f54e25..1d2b9277 100644
--- a/SAX/helpers/XMLFilterImpl.h
+++ b/SAX/helpers/XMLFilterImpl.h
@@ -7,6 +7,7 @@
 #include <string>
 #include <SAX/XMLFilter.h>
 #include <SAX/helpers/DefaultHandler.h>
+#include <SAX/SAXNotRecognizedException.h>
 
 namespace SAX
 {