diff --git a/reactos/services/umpnpmgr/umpnpmgr.c b/reactos/services/umpnpmgr/umpnpmgr.c
index bb9ce0a797c..b9b5659091b 100644
--- a/reactos/services/umpnpmgr/umpnpmgr.c
+++ b/reactos/services/umpnpmgr/umpnpmgr.c
@@ -79,7 +79,7 @@ PnpEventThread(LPVOID lpParameter)
     DPRINT("Calling NtGetPlugPlayEvent()\n");
 
     /* Wait for the next pnp event */
-    Status = NtGetPlugPlayEvent(0, 0, PnpEvent, 1024);
+    Status = NtGetPlugPlayEvent(0, 0, PnpEvent, PnpEventSize);
     /* Resize the buffer for the PnP event if it's too small. */
     if (Status == STATUS_BUFFER_TOO_SMALL)
     {