diff --git a/src/Dialog_Progress.cc b/src/Dialog_Progress.cc
index 8c328b5c..90f1a97b 100644
--- a/src/Dialog_Progress.cc
+++ b/src/Dialog_Progress.cc
@@ -339,7 +339,7 @@ void Dialog_Progress::on_cancel()
 				sigc::mem_fun(*this, &Dialog_Progress::cancel_timeout), 1000 );
 		}
 		else cancelbutton->set_label( _("Force Cancel") );
-		operations[t]->operation_detail.signal_cancel( cancel );
+		operations[t]->operation_detail.signal_cancel.emit( cancel );
 		cancel = true;
 	}
 }
diff --git a/src/OperationDetail.cc b/src/OperationDetail.cc
index b73a1fdb..3b9ac8cf 100644
--- a/src/OperationDetail.cc
+++ b/src/OperationDetail.cc
@@ -190,7 +190,7 @@ void OperationDetail::cancel( bool force )
 		cancelflag = 2;
 	else
 		cancelflag = 1;
-	signal_cancel(force);
+	signal_cancel.emit( force );
 }
 
 ProgressBar & OperationDetail::get_progressbar() const