diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 447bd96ee658aacc085875cd014a6bcb782e6a96..43a0efe7e513f01f626d26c8987b0681fb288a76 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -701,8 +701,6 @@ extern unsigned long tracing_thresh;
 
 /* PID filtering */
 
-extern int pid_max;
-
 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
 			     pid_t search_pid);
 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,