diff --git a/include/linux/pid.h b/include/linux/pid.h
index 14a9a39da9c7..b6f4ba16065a 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -109,7 +109,6 @@ extern struct pid *find_vpid(int nr);
  */
 extern struct pid *find_get_pid(int nr);
 extern struct pid *find_ge_pid(int nr, struct pid_namespace *);
-int next_pidmap(struct pid_namespace *pid_ns, unsigned int last);
 
 extern struct pid *alloc_pid(struct pid_namespace *ns);
 extern void free_pid(struct pid *pid);