diff --git a/include/migration/migration.h b/include/migration/migration.h
index 2d5b630cce..95261c1886 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -87,8 +87,6 @@ void migrate_fd_error(MigrationState *s);
 
 void migrate_fd_connect(MigrationState *s);
 
-ssize_t migrate_fd_put_buffer(MigrationState *s, const void *data,
-                              size_t size);
 int migrate_fd_close(MigrationState *s);
 
 void add_migration_state_change_notifier(Notifier *notify);
diff --git a/migration.c b/migration.c
index d6ec3e8fdc..1f4c6ee16f 100644
--- a/migration.c
+++ b/migration.c
@@ -302,8 +302,8 @@ static void migrate_fd_completed(MigrationState *s)
     notifier_list_notify(&migration_state_notifiers, s);
 }
 
-ssize_t migrate_fd_put_buffer(MigrationState *s, const void *data,
-                              size_t size)
+static ssize_t migrate_fd_put_buffer(MigrationState *s, const void *data,
+                                     size_t size)
 {
     ssize_t ret;