diff --git a/src/mathed/InsetMathHull.cpp b/src/mathed/InsetMathHull.cpp
index 32a0d81bf0..efefb04fa0 100644
--- a/src/mathed/InsetMathHull.cpp
+++ b/src/mathed/InsetMathHull.cpp
@@ -908,7 +908,15 @@ bool InsetMathHull::notifyCursorLeaves(Cursor const & old, Cursor & cur)
 {
 	if (RenderPreview::previewMath()) {
 		reloadPreview(old);
-		cur.screenUpdateFlags(Update::SinglePar);
+		/** FIXME: currently, SinglePar operates on the current
+		 * paragraph at processUpdateFlags time (here cur) and not the
+		 * paragraph where the change happened (old). When this is
+		 * fixed, the following test will become useless.
+		 */
+		if (&old.innerParagraph() == &cur.innerParagraph())
+			cur.screenUpdateFlags(Update::SinglePar);
+		else
+			cur.screenUpdateFlags(Update::Force);
 	}
 	return false;
 }