diff --git a/src/topp/SageAdapter.cpp b/src/topp/SageAdapter.cpp
index d2537880a84..1ddf7b6d865 100644
--- a/src/topp/SageAdapter.cpp
+++ b/src/topp/SageAdapter.cpp
@@ -1044,7 +1044,7 @@ vector<PeptideIdentification> mapDifftoMods(DeltaMassHistogram hist, DeltaMassto
               << "--write-pin"; 
   }
 
-    if (batch >= 1) arguments << "--batch-size" << QString(batch);
+    if (batch >= 1) arguments << "--batch-size" << String(batch).toQString();
     
     for (auto s : input_files) arguments << s.toQString();