diff --git a/input/drivers/dinput.c b/input/drivers/dinput.c
index b4ab37aebe..add7cad1ca 100644
--- a/input/drivers/dinput.c
+++ b/input/drivers/dinput.c
@@ -265,9 +265,14 @@ static void dinput_poll(void *data)
          }
       }
       else
+      {
          /* Shifts only when window focused */
          dinput_keyboard_mods(di, RETROKMOD_SHIFT);
 
+         /* Ignore 'unknown/undefined' key */
+         di->state[RETROK_UNKNOWN] = 0;
+      }
+
       /* Left alt keyup when unfocused, to prevent alt-tab sticky */
       dinput_keyboard_mods(di, RETROKMOD_ALT);
    }
diff --git a/input/drivers/winraw_input.c b/input/drivers/winraw_input.c
index 3c0a13db89..334249925d 100644
--- a/input/drivers/winraw_input.c
+++ b/input/drivers/winraw_input.c
@@ -500,6 +500,7 @@ static LRESULT CALLBACK winraw_callback(
          /* Ignored scancodes */
          switch (mcode)
          {
+            case RETROK_UNKNOWN:
             case 0xE11D:
             case 0xE02A:
             case 0xE036: