diff --git a/drivers/isdn/sc/shmem.c b/drivers/isdn/sc/shmem.c
index 712220cef139..7f16d75d2d89 100644
--- a/drivers/isdn/sc/shmem.c
+++ b/drivers/isdn/sc/shmem.c
@@ -54,7 +54,7 @@ void memcpy_toshmem(int card, void *dest, const void *src, size_t n)
 	spin_unlock_irqrestore(&sc_adapter[card]->lock, flags);
 	pr_debug("%s: set page to %#x\n",sc_adapter[card]->devicename,
 		((sc_adapter[card]->shmem_magic + ch * SRAM_PAGESIZE)>>14)|0x80);
-	pr_debug("%s: copying %d bytes from %#lx to %#lx\n",
+	pr_debug("%s: copying %zu bytes from %#lx to %#lx\n",
 		sc_adapter[card]->devicename, n,
 		(unsigned long) src,
 		sc_adapter[card]->rambase + ((unsigned long) dest %0x4000));