diff --git a/core/fileprinter.cpp b/core/fileprinter.cpp
index 5ba0354b8..1bc2bf192 100644
--- a/core/fileprinter.cpp
+++ b/core/fileprinter.cpp
@@ -32,7 +32,7 @@
 
 using namespace Okular;
 
-int FilePrinter::printFile( QPrinter &printer, QString file, FileDeletePolicy fileDeletePolicy,
+int FilePrinter::printFile( QPrinter &printer, const QString file, FileDeletePolicy fileDeletePolicy,
                             PageSelectPolicy pageSelectPolicy, const QString &pageRange )
 {
     FilePrinter fp;