diff --git a/dev/tools/gen_keycodes/data/key_data.json b/dev/tools/gen_keycodes/data/key_data.json
index dc01b37cf3..1c2c6b358a 100644
--- a/dev/tools/gen_keycodes/data/key_data.json
+++ b/dev/tools/gen_keycodes/data/key_data.json
@@ -6619,7 +6619,8 @@
         "RIGHT_ALT"
       ],
       "gtk": [
-        "Alt_R"
+        "Alt_R",
+        "ISO_Level3_Shift"
       ],
       "windows": [
         "RMENU"
@@ -6644,7 +6645,8 @@
         346
       ],
       "gtk": [
-        65514
+        65514,
+        65027
       ],
       "windows": [
         165
diff --git a/dev/tools/gen_keycodes/data/key_name_to_gtk_name.json b/dev/tools/gen_keycodes/data/key_name_to_gtk_name.json
index bf40132b44..09a2045c3b 100644
--- a/dev/tools/gen_keycodes/data/key_name_to_gtk_name.json
+++ b/dev/tools/gen_keycodes/data/key_name_to_gtk_name.json
@@ -1,6 +1,6 @@
 {
   "altLeft": ["Alt_L"],
-  "altRight": ["Alt_R"],
+  "altRight": ["Alt_R", "ISO_Level3_Shift"],
   "arrowDown": ["Down", "KP_Down"],
   "arrowLeft": ["Left", "KP_Left"],
   "arrowRight": ["Right", "KP_Right"],
diff --git a/packages/flutter/lib/src/services/keyboard_maps.dart b/packages/flutter/lib/src/services/keyboard_maps.dart
index af26748c35..5739e6e4a1 100644
--- a/packages/flutter/lib/src/services/keyboard_maps.dart
+++ b/packages/flutter/lib/src/services/keyboard_maps.dart
@@ -1664,6 +1664,7 @@ const Map<int, LogicalKeyboardKey> kGtkToLogicalKey = <int, LogicalKeyboardKey>{
   65508: LogicalKeyboardKey.controlRight,
   65506: LogicalKeyboardKey.shiftRight,
   65514: LogicalKeyboardKey.altRight,
+  65027: LogicalKeyboardKey.altRight,
   65512: LogicalKeyboardKey.metaRight,
   269025026: LogicalKeyboardKey.brightnessUp,
   269025027: LogicalKeyboardKey.brightnessDown,