diff --git a/arch/nios2/include/asm/io.h b/arch/nios2/include/asm/io.h
index d0adf08cd6a54be52ff688fc0bc38464a13b3008..e7da35b0c9efa9920487d36e28fce733b18d84a4 100644
--- a/arch/nios2/include/asm/io.h
+++ b/arch/nios2/include/asm/io.h
@@ -39,7 +39,11 @@ static inline void unmap_physmem(void *vaddr, unsigned long flags)
 
 static inline phys_addr_t virt_to_phys(void * vaddr)
 {
-	return (phys_addr_t)(vaddr);
+	DECLARE_GLOBAL_DATA_PTR;
+	if (gd->arch.has_mmu)
+		return (phys_addr_t)vaddr & 0x1fffffff;
+	else
+		return (phys_addr_t)vaddr & 0x7fffffff;
 }
 
 static inline void *ioremap(unsigned long physaddr, unsigned long size)