diff --git a/aegisub/src/base_grid.h b/aegisub/src/base_grid.h
index a214ac05b..1e97779d4 100644
--- a/aegisub/src/base_grid.h
+++ b/aegisub/src/base_grid.h
@@ -136,7 +136,7 @@ public:
 	virtual AssDialogue * GetActiveLine() const { return active_line; }
 	virtual void SetSelectedSet(const Selection &new_selection);
 	virtual void GetSelectedSet(Selection &res) const { res = selection; }
-	virtual Selection GetSelectedSet() const { return selection; }
+	virtual Selection const& GetSelectedSet() const { return selection; }
 	virtual void NextLine();
 	virtual void PrevLine();
 
diff --git a/aegisub/src/selection_controller.h b/aegisub/src/selection_controller.h
index 13b57e9fa..31e654769 100644
--- a/aegisub/src/selection_controller.h
+++ b/aegisub/src/selection_controller.h
@@ -127,7 +127,7 @@ public:
 
 	/// @brief Obtain the selected set
 	/// @return The selected set
-	virtual Selection GetSelectedSet() const = 0;
+	virtual Selection const& GetSelectedSet() const = 0;
 
 	/// @brief Change the active line to the next in sequence
 	///