diff --git a/source/platform/terminal.cpp b/source/platform/terminal.cpp
index bb3ab735..f96eabec 100644
--- a/source/platform/terminal.cpp
+++ b/source/platform/terminal.cpp
@@ -333,10 +333,10 @@ void TermIO::keyModsOff(StdioCtl &io) noexcept
 void TermIO::normalizeKey(KeyDownEvent &keyDown) noexcept
 {
     TKey key(keyDown);
-    if (key.mods & (kbShift | kbCtrlShift | kbAltShift))
+    if (key.mods & (kbShift | kbCtrlShift | kbLeftAlt))
     {
         // Modifier precedece: Shift < Ctrl < Alt.
-        int largestMod = (key.mods & kbAltShift) ? 2
+        int largestMod = (key.mods & kbLeftAlt) ? 2
                        : (key.mods & kbCtrlShift) ? 1
                        : 0;
         if (ushort keyCode = moddedKeyCodes[key.code][largestMod])
diff --git a/source/tvision/tkey.cpp b/source/tvision/tkey.cpp
index c4a6ccd0..ff00b8a2 100644
--- a/source/tvision/tkey.cpp
+++ b/source/tvision/tkey.cpp
@@ -249,14 +249,14 @@ TKey::TKey(ushort keyCode, ushort shiftState) noexcept
     ushort mods =
         (shiftState & kbShift ? kbShift : 0) |
         (shiftState & kbCtrlShift ? kbCtrlShift : 0) |
-        (shiftState & kbAltShift ? kbAltShift : 0);
+        (shiftState & kbLeftAlt ? kbAltShift : 0);
     uchar scanCode = keyCode >> 8;
     uchar charCode = keyCode & 0xFF;
 
     const TKeyCodeLookupEntry *entry = 0;
     if (keyCode <= kbCtrlZ || isRawCtrlKey(scanCode, charCode))
         entry = &ctrlKeyLookup[charCode];
-    else if ((keyCode & 0xFF) == 0)
+    else if (charCode == 0)
     {
         if (scanCode < extKeyLookupSize)
             entry = &extKeyLookup[scanCode];
diff --git a/test/tvision/tkey.test.cpp b/test/tvision/tkey.test.cpp
index 0984a63a..53731d37 100644
--- a/test/tvision/tkey.test.cpp
+++ b/test/tvision/tkey.test.cpp
@@ -55,6 +55,7 @@ TEST(TKey, ShouldConstructProperly)
         {{'A', kbCtrlShift | kbAltShift}, {'A', kbCtrlShift | kbAltShift}},
         {{'A', kbShift | kbCtrlShift | kbAltShift}, {'A', kbShift | kbCtrlShift | kbAltShift}},
         {{'a'}, {'A'}},
+        {{'a', kbRightAlt}, {'A'}},
         {{'a', kbShift}, {'A', kbShift}},
         {{'a', kbCtrlShift}, {'A', kbCtrlShift}},
         {{'a', kbShift | kbCtrlShift}, {'A', kbShift | kbCtrlShift}},