diff --git a/src/plugins/platforms/xcb/qxcbkeyboard.cpp b/src/plugins/platforms/xcb/qxcbkeyboard.cpp
index 3caee3f..5e30f25 100644
--- a/src/plugins/platforms/xcb/qxcbkeyboard.cpp
+++ b/src/plugins/platforms/xcb/qxcbkeyboard.cpp
@@ -60,11 +60,11 @@
         ret |= Qt::ShiftModifier;
     if (s & XCB_MOD_MASK_CONTROL)
         ret |= Qt::ControlModifier;
-    if (s & rmod_masks.alt)
+    if ((s & rmod_masks.alt) == rmod_masks.alt)
         ret |= Qt::AltModifier;
-    if (s & rmod_masks.meta)
+    if ((s & rmod_masks.meta) == rmod_masks.meta)
         ret |= Qt::MetaModifier;
-    if (s & rmod_masks.altgr)
+    if ((s & rmod_masks.altgr) == rmod_masks.altgr)
         ret |= Qt::GroupSwitchModifier;
     return ret;
 }