diff --git a/drivers/block/DAC960.c b/drivers/block/DAC960.c
index 487ce64c5493fc84bba2bd6bbe303b369b9f4c78..8db9089127c5dac6d3f4b497e002aa3459af27f6 100644
--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -1177,7 +1177,8 @@ static bool DAC960_V1_EnableMemoryMailboxInterface(DAC960_Controller_T
   int TimeoutCounter;
   int i;
 
-  
+  memset(&CommandMailbox, 0, sizeof(DAC960_V1_CommandMailbox_T));
+
   if (pci_set_dma_mask(Controller->PCIDevice, DMA_BIT_MASK(32)))
 	return DAC960_Failure(Controller, "DMA mask out of range");
   Controller->BounceBufferLimit = DMA_BIT_MASK(32);