diff --git a/src/protocols/rdp/keyboard.c b/src/protocols/rdp/keyboard.c
index a75b7340..9a5d2a51 100644
--- a/src/protocols/rdp/keyboard.c
+++ b/src/protocols/rdp/keyboard.c
@@ -619,6 +619,7 @@ void guac_rdp_keyboard_update_modifiers(guac_rdp_keyboard* keyboard,
         guac_rdp_keyboard_update_keysym(keyboard, 0xFE03, 1, GUAC_RDP_KEY_SOURCE_SYNTHETIC);
     }
     else if (clear_flags & GUAC_RDP_KEYMAP_MODIFIER_ALTGR) {
+        guac_rdp_keyboard_update_keysym(keyboard, 0xFFEA, 0, GUAC_RDP_KEY_SOURCE_SYNTHETIC);
         guac_rdp_keyboard_update_keysym(keyboard, 0xFE03, 0, GUAC_RDP_KEY_SOURCE_SYNTHETIC);
     }
 
diff --git a/src/protocols/rdp/keymaps/base.keymap b/src/protocols/rdp/keymaps/base.keymap
index d02c5eab..09b664c6 100644
--- a/src/protocols/rdp/keymaps/base.keymap
+++ b/src/protocols/rdp/keymaps/base.keymap
@@ -84,6 +84,7 @@ map      0x1D ~ 0xffe3 # Control_L
 map +ext 0x1D ~ 0xffe4 # Control_R
 map      0x38 ~ 0xffe9 # Alt_L
 map +ext 0x38 ~ 0xffea # Alt_R
+map +ext 0x38 ~ 0xfe03 # AltGr
 map +ext 0x5B ~ 0xffeb # Super_L
 map +ext 0x5C ~ 0xffec # Super_R
 map +ext 0x5D ~ 0xff67 # Menu