diff --git a/src/frontends/qt4/GuiParagraph.cpp b/src/frontends/qt4/GuiParagraph.cpp
index 470dfeb792..20d621808a 100644
--- a/src/frontends/qt4/GuiParagraph.cpp
+++ b/src/frontends/qt4/GuiParagraph.cpp
@@ -338,6 +338,7 @@ void GuiParagraph::dispatchParams()
 
 	bufferview()->updateMetrics();
 	bufferview()->buffer().changed();
+	bufferview()->buffer().markDirty();
 }