diff --git a/src/LyXFunc.cpp b/src/LyXFunc.cpp
index 75c48112ea..49bd2363c4 100644
--- a/src/LyXFunc.cpp
+++ b/src/LyXFunc.cpp
@@ -1190,16 +1190,19 @@ void LyXFunc::dispatch(FuncRequest const & cmd)
 		case LFUN_BUFFER_SWITCH:
 			BOOST_ASSERT(lyx_view_);
 			lyx_view_->setBuffer(theBufferList().getBuffer(argument));
+			updateFlags = Update::Force;
 			break;
 
 		case LFUN_BUFFER_NEXT:
 			BOOST_ASSERT(lyx_view_);
 			lyx_view_->setBuffer(theBufferList().next(view()->buffer()));
+			updateFlags = Update::Force;
 			break;
 
 		case LFUN_BUFFER_PREVIOUS:
 			BOOST_ASSERT(lyx_view_);
 			lyx_view_->setBuffer(theBufferList().previous(view()->buffer()));
+			updateFlags = Update::Force;
 			break;
 
 		case LFUN_FILE_NEW:
diff --git a/status.15x b/status.15x
index 9c885db5e5..1bd37428eb 100644
--- a/status.15x
+++ b/status.15x
@@ -41,6 +41,8 @@ What's new
 
 * USER INTERFACE:
 
+- Fix redrawing artefacts when switching tabs (bug 3969).
+
 - Don't allow invalid listings parameters to be passed when
   updating other controls in listings-related dialogs (bug 4053).