diff --git a/include/JournallingObject.h b/include/JournallingObject.h
index b9ada746e..c3a93a1cd 100644
--- a/include/JournallingObject.h
+++ b/include/JournallingObject.h
@@ -77,7 +77,8 @@ public:
 		return oldJournalling;
 	}
 
-	inline bool isEmpty() {
+	inline bool isEmpty() const
+	{
 		return m_journallingStateStack.isEmpty();
 	}
 
diff --git a/src/gui/widgets/knob.cpp b/src/gui/widgets/knob.cpp
index dabd9cc49..141ae143f 100644
--- a/src/gui/widgets/knob.cpp
+++ b/src/gui/widgets/knob.cpp
@@ -592,7 +592,8 @@ void knob::mouseReleaseEvent( QMouseEvent* event )
 		AutomatableModel *thisModel = model();
 		if( thisModel )
 		{
-			if(!thisModel->isEmpty()) {
+			if( !thisModel->isEmpty() )
+			{
 				thisModel->restoreJournallingState();
 			}
 		}