diff --git a/drivers/staging/comedi/drivers/plx9080.h b/drivers/staging/comedi/drivers/plx9080.h
index 8d3caf6b4e86..c4920f8654d0 100644
--- a/drivers/staging/comedi/drivers/plx9080.h
+++ b/drivers/staging/comedi/drivers/plx9080.h
@@ -412,7 +412,7 @@ enum bigend_bits {
 
 /* system allocates this many bytes for address mapping mailbox space */
 #define MBX_ADDR_SPACE_360 0x80	/* wanXL100s/200/400 */
-#define MBX_ADDR_MASK_360 (MBX_ADDR_SPACE_360-1)
+#define MBX_ADDR_MASK_360 (MBX_ADDR_SPACE_360 - 1)
 
 static inline int plx9080_abort_dma(void __iomem *iobase, unsigned int channel)
 {