diff --git a/aard.cc b/aard.cc
index a26ec970..8ac8089c 100644
--- a/aard.cc
+++ b/aard.cc
@@ -847,7 +847,7 @@ vector< sptr< Dictionary::Class > > makeDictionaries(
 
           {
             QFileInfo info( FsEncoding::decode( i->c_str() ) );
-            if( info.size() > ULONG_MAX )
+            if( static_cast< quint64 >( info.size() ) > ULONG_MAX )
             {
               gdWarning( "File %s is too large\n", i->c_str() );
               continue;
diff --git a/xdxf.cc b/xdxf.cc
index 23a7678b..7cf64e1b 100644
--- a/xdxf.cc
+++ b/xdxf.cc
@@ -694,7 +694,7 @@ protected:
 
   virtual qint64 readData( char * data, qint64 maxSize );
 
-  virtual bool atEnd();
+  virtual bool atEnd() const;
 
   virtual qint64 writeData ( const char * /*data*/, qint64 /*maxSize*/ )
   { return -1; }
@@ -717,7 +717,7 @@ GzippedFile::~GzippedFile()
       dict_data_close( dz );
 }
 
-bool GzippedFile::atEnd()
+bool GzippedFile::atEnd() const
 {
   return gzeof( gz );
 }