diff --git a/ui/qt/main_window.h b/ui/qt/main_window.h
index 49215c34ef..ebe7626925 100644
--- a/ui/qt/main_window.h
+++ b/ui/qt/main_window.h
@@ -122,7 +122,7 @@ signals:
 
 public slots:
     // in main_window_slots.cpp
-    void openCaptureFile(QString& cf_path = *new QString());
+    void openCaptureFile(QString& cf_path = *new QString(), QString &display_filter = *new QString());
 
 #ifdef HAVE_LIBPCAP
     void captureCapturePrepared(capture_options *capture_opts);
diff --git a/ui/qt/main_window_slots.cpp b/ui/qt/main_window_slots.cpp
index c793b71ea5..018010546b 100644
--- a/ui/qt/main_window_slots.cpp
+++ b/ui/qt/main_window_slots.cpp
@@ -67,10 +67,9 @@
 // Public slots
 //
 
-void MainWindow::openCaptureFile(QString &cf_path)
+void MainWindow::openCaptureFile(QString &cf_path, QString &display_filter)
 {
     QString file_name = "";
-    QString display_filter = "";
     dfilter_t *rfcode = NULL;
     int err;