diff --git a/arch/parisc/mm/ioremap.c b/arch/parisc/mm/ioremap.c
index 92d496ad07c97b9be730f8799bf96f7c5a538d3b..838d0259cd2715e034ce7787eba12ac4cc7ae9c4 100644
--- a/arch/parisc/mm/ioremap.c
+++ b/arch/parisc/mm/ioremap.c
@@ -71,7 +71,7 @@ void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned l
 	 */
 	offset = phys_addr & ~PAGE_MASK;
 	phys_addr &= PAGE_MASK;
-	size = PAGE_ALIGN(last_addr) - phys_addr;
+	size = PAGE_ALIGN(last_addr + 1) - phys_addr;
 
 	/*
 	 * Ok, go for it..