diff --git a/mm/map/vm_region.c b/mm/map/vm_region.c
index 0c94c74de4..9029742c45 100644
--- a/mm/map/vm_region.c
+++ b/mm/map/vm_region.c
@@ -125,7 +125,7 @@ FAR void *vm_map_region(uintptr_t paddr, size_t size)
         }
     }
 
-  return vaddr + (MM_PGMASK & paddr);
+  return (FAR void *)((uintptr_t)vaddr + (MM_PGMASK & paddr));
 
 error:
   if (i)   /* undo alway mapped pages */