diff --git a/base/memory/container_of.h b/base/memory/container_of.h
index ddb795935..faf167964 100644
--- a/base/memory/container_of.h
+++ b/base/memory/container_of.h
@@ -18,7 +18,7 @@
 //----------------------------------------------------------------
 
 #define container_of(v, t, head) \
-    ((t *)((const char *)(v) - offsetof(t, head)))
+    ((t *)((char *)(v) - offsetof(t, head)))
 
 //----------------------------------------------------------------
 
diff --git a/libdm/libdevmapper.h b/libdm/libdevmapper.h
index 03a43eb45..e9b140563 100644
--- a/libdm/libdevmapper.h
+++ b/libdm/libdevmapper.h
@@ -2471,7 +2471,7 @@ struct dm_list *dm_list_next(const struct dm_list *head, const struct dm_list *e
  * contained in a structure of type t, return the containing structure.
  */
 #define dm_list_struct_base(v, t, head) \
-    ((t *)((const char *)(v) - offsetof(t, head)))
+    ((t *)((char *)(v) - offsetof(t, head)))
 
 /*
  * Given the address v of an instance of 'struct dm_list list' contained in