diff --git a/src/racket/src/places.c b/src/racket/src/places.c
index bdfcc6ff86..5bddbdef1c 100644
--- a/src/racket/src/places.c
+++ b/src/racket/src/places.c
@@ -11,7 +11,7 @@ READ_ONLY static Scheme_Object *scheme_def_place_exit_proc;
 
 SHARED_OK mz_proc_thread *scheme_master_proc_thread;
 THREAD_LOCAL_DECL(mz_proc_thread *proc_thread_self);
-Scheme_Object *scheme_place(int argc, Scheme_Object *args[]);
+static Scheme_Object *scheme_place(int argc, Scheme_Object *args[]);
 static Scheme_Object *scheme_place_wait(int argc, Scheme_Object *args[]);
 static Scheme_Object *scheme_place_sleep(int argc, Scheme_Object *args[]);
 static Scheme_Object *scheme_place_p(int argc, Scheme_Object *args[]);
@@ -21,15 +21,16 @@ static Scheme_Object *scheme_place_recv(int argc, Scheme_Object *args[]);
 static Scheme_Object *scheme_place_channel_p(int argc, Scheme_Object *args[]);
 static Scheme_Object *def_place_exit_handler_proc(int argc, Scheme_Object *args[]);
 
-Scheme_Object *scheme_place_async_channel_create();
-Scheme_Object *scheme_place_bi_channel_create();
-Scheme_Object *scheme_place_bi_peer_channel_create(Scheme_Object *orig);
+static Scheme_Object *scheme_place_async_channel_create();
+static Scheme_Object *scheme_place_bi_channel_create();
+static Scheme_Object *scheme_place_bi_peer_channel_create(Scheme_Object *orig);
 static void scheme_place_bi_channel_set_signal(Scheme_Object *cho);
 static int scheme_place_channel_ready(Scheme_Object *so);
 
-void scheme_place_async_send(Scheme_Place_Async_Channel *ch, Scheme_Object *o);
-Scheme_Object *scheme_place_async_recv(Scheme_Place_Async_Channel *ch);
-Scheme_Object *scheme_places_deep_copy_worker(Scheme_Object *so, Scheme_Hash_Table *ht);
+
+static void scheme_place_async_send(Scheme_Place_Async_Channel *ch, Scheme_Object *o);
+static Scheme_Object *scheme_place_async_recv(Scheme_Place_Async_Channel *ch);
+static Scheme_Object *scheme_places_deep_copy_worker(Scheme_Object *so, Scheme_Hash_Table *ht);
 
 # ifdef MZ_PRECISE_GC
 static void register_traversers(void);
diff --git a/src/racket/src/schpriv.h b/src/racket/src/schpriv.h
index 93a7b2abe0..955bc63f79 100644
--- a/src/racket/src/schpriv.h
+++ b/src/racket/src/schpriv.h
@@ -3470,11 +3470,6 @@ typedef struct Scheme_Place_Async_Channel {
   void *wakeup_signal;
 } Scheme_Place_Async_Channel;
 
-Scheme_Object *scheme_place_async_channel_create();
-void scheme_place_async_send(Scheme_Place_Async_Channel *ch, Scheme_Object *o);
-Scheme_Object *scheme_place_async_recv(Scheme_Place_Async_Channel *ch);
-
-
 Scheme_Env *scheme_place_instance_init();
 void scheme_place_instance_destroy();
 void scheme_kill_green_thread_timer();