diff --git a/aegisub/src/base_grid.cpp b/aegisub/src/base_grid.cpp
index 745fef4c4..c899a5b64 100644
--- a/aegisub/src/base_grid.cpp
+++ b/aegisub/src/base_grid.cpp
@@ -796,6 +796,12 @@ void BaseGrid::OnMouseEvent(wxMouseEvent &event) {
 			return;
 		}
 
+		// Keep selection
+		if (click && !shift && !ctrl && alt) {
+			SetActiveLine(dlg);
+			return;
+		}
+
 		// Block select
 		if ((click && shift && !alt) || (holding && !ctrl && !alt && !shift)) {
 			if (lastRow != -1) {