diff --git a/reactos/drivers/input/mouclass/mouclass.c b/reactos/drivers/input/mouclass/mouclass.c
index 79877de52b1..dbcf90e2657 100644
--- a/reactos/drivers/input/mouclass/mouclass.c
+++ b/reactos/drivers/input/mouclass/mouclass.c
@@ -705,8 +705,10 @@ ClassCancelRoutine(
 
 	ASSERT(ClassDeviceExtension->Common.IsClassDO);
 
+	IoReleaseCancelSpinLock(Irp->CancelIrql);
+
 	KeAcquireSpinLock(&ClassDeviceExtension->SpinLock, &OldIrql);
-	IoAcquireCancelSpinLock(&OldIrql);
+
 	if (ClassDeviceExtension->PendingIrp == Irp)
 	{
 		ClassDeviceExtension->PendingIrp = NULL;