diff --git a/arch/mips/ralink/mt7621.c b/arch/mips/ralink/mt7621.c
index a4bdda8541c0..ae7b8cfedd5f 100644
--- a/arch/mips/ralink/mt7621.c
+++ b/arch/mips/ralink/mt7621.c
@@ -63,7 +63,7 @@ phys_addr_t mips_cpc_default_phys_base(void)
 
 static bool __init mt7621_addr_wraparound_test(phys_addr_t size)
 {
-	void *dm = (void *)KSEG1ADDR(&detect_magic);
+	void __iomem *dm = (void __iomem *)KSEG1ADDR(&detect_magic);
 
 	if (CPHYSADDR(dm + size) >= MT7621_LOWMEM_MAX_SIZE)
 		return true;