diff --git a/drivers/staging/unisys/include/iochannel.h b/drivers/staging/unisys/include/iochannel.h
index 53259d611bd3..ca9d6f9718ea 100644
--- a/drivers/staging/unisys/include/iochannel.h
+++ b/drivers/staging/unisys/include/iochannel.h
@@ -48,7 +48,6 @@
 
 /* Defines and enums. */
 #define MINNUM(a, b) (((a) < (b)) ? (a) : (b))
-#define MAXNUM(a, b) (((a) > (b)) ? (a) : (b))
 
 /* Define the two queues per data channel between iopart and ioguestparts. */