diff --git a/src/win32_window.c b/src/win32_window.c
index b5c03ea3f..96b308e3c 100644
--- a/src/win32_window.c
+++ b/src/win32_window.c
@@ -329,6 +329,13 @@ static int translateKey(WPARAM wParam, LPARAM lParam)
         return GLFW_KEY_LEFT_CONTROL;
     }
 
+    if (wParam == VK_PROCESSKEY)
+    {
+        // IME notify of filtered keys by setting the virtual key-code to VK_PROCESSKEY
+
+        return _GLFW_KEY_INVALID;
+    }
+
     return _glfw.win32.publicKeys[HIWORD(lParam) & 0x1FF];
 }