diff --git a/compat/obstack.h b/compat/obstack.h
index ae36ed6a669d96..cfb947a4c585a9 100644
--- a/compat/obstack.h
+++ b/compat/obstack.h
@@ -182,13 +182,13 @@ struct obstack		/* control current object in current chunk */
 
 /* Declare the external functions we use; they are in obstack.c.  */
 
-extern void _obstack_newchunk (struct obstack *, int);
-extern int _obstack_begin (struct obstack *, int, int,
+void _obstack_newchunk (struct obstack *, int);
+int _obstack_begin (struct obstack *, int, int,
 			    void *(*) (long), void (*) (void *));
-extern int _obstack_begin_1 (struct obstack *, int, int,
+int _obstack_begin_1 (struct obstack *, int, int,
 			     void *(*) (void *, long),
 			     void (*) (void *, void *), void *);
-extern int _obstack_memory_used (struct obstack *);
+int _obstack_memory_used (struct obstack *);
 
 void obstack_free (struct obstack *, void *);
 
diff --git a/promisor-remote.h b/promisor-remote.h
index c3c07c2a231d6c..cdb0bcd9ead22c 100644
--- a/promisor-remote.h
+++ b/promisor-remote.h
@@ -15,15 +15,15 @@ struct promisor_remote {
 	const char name[FLEX_ARRAY];
 };
 
-extern void promisor_remote_reinit(void);
-extern struct promisor_remote *promisor_remote_find(const char *remote_name);
-extern int has_promisor_remote(void);
-extern int promisor_remote_get_direct(const struct object_id *oids, int oid_nr);
+void promisor_remote_reinit(void);
+struct promisor_remote *promisor_remote_find(const char *remote_name);
+int has_promisor_remote(void);
+int promisor_remote_get_direct(const struct object_id *oids, int oid_nr);
 
 /*
  * This should be used only once from setup.c to set the value we got
  * from the extensions.partialclone config option.
  */
-extern void set_repository_format_partial_clone(char *partial_clone);
+void set_repository_format_partial_clone(char *partial_clone);
 
 #endif /* PROMISOR_REMOTE_H */