diff --git a/src/qt/xkbcommon_keyboard.cpp b/src/qt/xkbcommon_keyboard.cpp
index 181f9e057..788087998 100644
--- a/src/qt/xkbcommon_keyboard.cpp
+++ b/src/qt/xkbcommon_keyboard.cpp
@@ -152,6 +152,7 @@ static std::unordered_map<std::string, uint16_t> xkb_keycodes = {
     {"FK13", 0x137}, /* F13 => SysRq (for Apple keyboards) */
     {"RALT", 0x138},
     {"ALGR", 0x138},
+    {"LVL3", 0x138}, /* observed on TigerVNC with AltGr-enabled layout */
     {"PAUS", 0x145},
     {"FK15", 0x145}, /* F15 => Pause (for Apple keyboards) */
     {"BRK",  0x145},