diff --git a/plover/oslayer/windows/keyboardcontrol.py b/plover/oslayer/windows/keyboardcontrol.py
index 33478dbeb..8dddf8998 100644
--- a/plover/oslayer/windows/keyboardcontrol.py
+++ b/plover/oslayer/windows/keyboardcontrol.py
@@ -326,7 +326,7 @@ def on_key(pressed, event):
             if event.flags & LLKHF_EXTENDED:
                 return False
 
-            if event.flags & 0x10:
+            if event.flags & LLKHF_INJECTED:
                 # Ignore simulated events (e.g. from KeyboardEmulation).
                 return False
             if event.vkCode in PASSTHROUGH_KEYS: