diff --git a/subsystems/ntvdm/ps2.c b/subsystems/ntvdm/ps2.c
index cdaacd263e3..5138d0b887c 100644
--- a/subsystems/ntvdm/ps2.c
+++ b/subsystems/ntvdm/ps2.c
@@ -93,9 +93,13 @@ BYTE KeyboardReadStatus()
 {
     BYTE Status = 0;
 
+    WaitForSingleObject(QueueMutex, INFINITE);
+
     /* Set the first bit if the data can be read */
     if (KeyboardReadResponse || !KeyboardQueueEmpty) Status |= 1 << 0;
 
+    ReleaseMutex(QueueMutex);
+
     /* Always set bit 2 */
     Status |= 1 << 2;