diff --git a/Scheduler/ReadHelper.hh b/Scheduler/ReadHelper.hh
index 976c4ae352bd78e9070e2ad4f62a118846092957..85965e57b61ea0d4967c27bd530b0b18247b3fbe 100644
--- a/Scheduler/ReadHelper.hh
+++ b/Scheduler/ReadHelper.hh
@@ -129,7 +129,7 @@ namespace senf {
     private:
         struct InternalPredicate;
 
-        ReadHelper(Handle handle, std::string::size_teyp maxSize,  
+        ReadHelper(Handle handle, std::string::size_type maxSize,  
                    InternalPredicate * predicate, Callback cb);
 
         static void dispatchProcess(ptr helper, Handle handle, int event);