diff --git a/src/corelib/global/qnamespace.h b/src/corelib/global/qnamespace.h
index ad4150b317..ae5f3f9e3d 100644
--- a/qtbase/src/corelib/global/qnamespace.h
+++ b/qtbase/src/corelib/global/qnamespace.h
@@ -915,10 +915,6 @@ public:
         Key_Dead_Small_Schwa    = 0x0100128a,
         Key_Dead_Capital_Schwa  = 0x0100128b,
         Key_Dead_Greek          = 0x0100128c,
-        Key_Dead_Lowline        = 0x01001290,
-        Key_Dead_Aboveverticalline = 0x01001291,
-        Key_Dead_Belowverticalline = 0x01001292,
-        Key_Dead_Longsolidusoverlay = 0x01001293,
 
         // multimedia/internet keys - ignored by default - see QKeyEvent c'tor
         Key_Back  = 0x01000061,
diff --git a/src/corelib/global/qnamespace.qdoc b/src/corelib/global/qnamespace.qdoc
index 9755121273..1b50dfb2ec 100644
--- a/qtbase/src/corelib/global/qnamespace.qdoc
+++ b/qtbase/src/corelib/global/qnamespace.qdoc
@@ -1708,10 +1708,6 @@
     \value Key_Dead_Small_Schwa
     \value Key_Dead_Capital_Schwa
     \value Key_Dead_Greek
-    \value Key_Dead_Lowline
-    \value Key_Dead_Aboveverticalline
-    \value Key_Dead_Belowverticalline
-    \value Key_Dead_Longsolidusoverlay
     \value Key_Back
     \value Key_Forward
     \value Key_Stop
diff --git a/src/platformsupport/input/xkbcommon/qxkbcommon.cpp b/src/platformsupport/input/xkbcommon/qxkbcommon.cpp
index b713c19447..225819b23e 100644
--- a/qtbase/src/platformsupport/input/xkbcommon/qxkbcommon.cpp
+++ b/qtbase/src/platformsupport/input/xkbcommon/qxkbcommon.cpp
@@ -273,10 +273,6 @@ static constexpr const auto KeyTbl = qMakeArray(
         Xkb2Qt<XKB_KEY_dead_small_schwa,        Qt::Key_Dead_Small_Schwa>,
         Xkb2Qt<XKB_KEY_dead_capital_schwa,      Qt::Key_Dead_Capital_Schwa>,
         Xkb2Qt<XKB_KEY_dead_greek,              Qt::Key_Dead_Greek>,
-        Xkb2Qt<XKB_KEY_dead_lowline,            Qt::Key_Dead_Lowline>,
-        Xkb2Qt<XKB_KEY_dead_aboveverticalline,  Qt::Key_Dead_Aboveverticalline>,
-        Xkb2Qt<XKB_KEY_dead_belowverticalline,  Qt::Key_Dead_Belowverticalline>,
-        Xkb2Qt<XKB_KEY_dead_longsolidusoverlay, Qt::Key_Dead_Longsolidusoverlay>,
 
         // Special keys from X.org - This include multimedia keys,
         // wireless/bluetooth/uwb keys, special launcher keys, etc.