diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 5b4bfb90fb942..e0c3bc2edbbd0 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -65,7 +65,7 @@ enum migratetype {
 };
 
 /* In mm/page_alloc.c; keep in sync also with show_migration_types() there */
-extern char * const migratetype_names[MIGRATE_TYPES];
+extern const char * const migratetype_names[MIGRATE_TYPES];
 
 #ifdef CONFIG_CMA
 #  define is_migrate_cma(migratetype) unlikely((migratetype) == MIGRATE_CMA)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 80373eca453dd..4115d7f20223f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -236,7 +236,7 @@ static char * const zone_names[MAX_NR_ZONES] = {
 #endif
 };
 
-char * const migratetype_names[MIGRATE_TYPES] = {
+const char * const migratetype_names[MIGRATE_TYPES] = {
 	"Unmovable",
 	"Movable",
 	"Reclaimable",