diff --git a/src/calibre/ebooks/pdf/reflow.cpp b/src/calibre/ebooks/pdf/reflow.cpp
index 43efe2c103..c08d7e5507 100644
--- a/src/calibre/ebooks/pdf/reflow.cpp
+++ b/src/calibre/ebooks/pdf/reflow.cpp
@@ -620,6 +620,7 @@ static string get_link_dest(LinkAction *link, PDFDoc *doc) {
       case actionSound: break;
       case actionJavaScript: break;
       case actionUnknown: break;
+      default: break;
   }
   return oss.str();
 }