diff --git a/src/source_language_protocol.cc b/src/source_language_protocol.cc
index 995caff..d6d608d 100644
--- a/src/source_language_protocol.cc
+++ b/src/source_language_protocol.cc
@@ -891,7 +891,7 @@ void Source::LanguageProtocolView::update_diagnostics(std::vector<LanguageProtoc
         if(!end.is_end())
           end.forward_char();
         else
-          start.forward_char();
+          start.backward_char();
       }
 
       bool error = false;