diff --git a/mm/early_ioremap.c b/mm/early_ioremap.c
index 74984c23a87e..9bc12e526ed0 100644
--- a/mm/early_ioremap.c
+++ b/mm/early_ioremap.c
@@ -17,6 +17,7 @@
 #include <linux/vmalloc.h>
 #include <asm/fixmap.h>
 #include <asm/early_ioremap.h>
+#include "internal.h"
 
 #ifdef CONFIG_MMU
 static int early_ioremap_debug __initdata;
diff --git a/mm/internal.h b/mm/internal.h
index f1554a4e249e..00d6e3e3ec45 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -154,6 +154,12 @@ extern unsigned long highest_memmap_pfn;
  */
 #define MAX_RECLAIM_RETRIES 16
 
+/*
+ * in mm/early_ioremap.c
+ */
+pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr,
+					unsigned long size, pgprot_t prot);
+
 /*
  * in mm/vmscan.c:
  */