diff --git a/aegisub/src/libresrc/default_menu.json b/aegisub/src/libresrc/default_menu.json
index a2fa48e68..da3ca6c8e 100644
--- a/aegisub/src/libresrc/default_menu.json
+++ b/aegisub/src/libresrc/default_menu.json
@@ -7,6 +7,7 @@
         {},
         { "command" : "edit/line/duplicate" },
         { "command" : "edit/line/duplicate/shift" },
+        { "command" : "edit/line/duplicate/shift_back" },
         {},
         { "command" : "grid/swap" },
         { "command" : "edit/line/join/concatenate", "text" : "&Join (concatenate)" },
diff --git a/aegisub/src/libresrc/osx/default_menu.json b/aegisub/src/libresrc/osx/default_menu.json
index 8206655c7..e26cec985 100644
--- a/aegisub/src/libresrc/osx/default_menu.json
+++ b/aegisub/src/libresrc/osx/default_menu.json
@@ -7,6 +7,7 @@
         {},
         { "command" : "edit/line/duplicate" },
         { "command" : "edit/line/duplicate/shift" },
+        { "command" : "edit/line/duplicate/shift_back" },
         {},
         { "command" : "grid/swap" },
         { "command" : "edit/line/join/concatenate", "text" : "&Join (concatenate)" },