diff -up print-manager-19.12.2/libkcups/KIppRequest.cpp.me print-manager-19.12.2/libkcups/KIppRequest.cpp
--- print-manager-19.12.2/libkcups/KIppRequest.cpp.me	2020-02-05 14:50:39.034138888 +0100
+++ print-manager-19.12.2/libkcups/KIppRequest.cpp	2020-02-05 15:12:38.225060476 +0100
@@ -189,7 +189,7 @@ QString KIppRequest::assembleUrif(const
     }
 
     httpAssembleURIf(HTTP_URI_CODING_ALL, uri, sizeof(uri), "ipp", cupsUser(), "localhost",
-                     ippPort(), destination.toUtf8().constData());
+                     ippPort(), "%s", destination.toUtf8().constData());
     return QString::fromLatin1(uri);
 }