diff --git a/include/trace/events/block.h b/include/trace/events/block.h
index 7f4dfbd..97cf6c2 100644
--- a/include/trace/events/block.h
+++ b/include/trace/events/block.h
@@ -12,6 +12,8 @@
 
 #define RWBS_LEN	8
 
+TRACE_DEFINE_ENUM(TASK_COMM_LEN);
+
 DECLARE_EVENT_CLASS(block_buffer,
 
 	TP_PROTO(struct buffer_head *bh),
diff --git a/include/trace/events/oom.h b/include/trace/events/oom.h
index 26a11e4..19de9a8 100644
--- a/include/trace/events/oom.h
+++ b/include/trace/events/oom.h
@@ -7,6 +7,8 @@
 #include <linux/tracepoint.h>
 #include <trace/events/mmflags.h>
 
+TRACE_DEFINE_ENUM(TASK_COMM_LEN);
+
 TRACE_EVENT(oom_score_adj_update,
 
 	TP_PROTO(struct task_struct *task),
diff --git a/include/trace/events/osnoise.h b/include/trace/events/osnoise.h
index 82f741e..ac3c0ab 100644
--- a/include/trace/events/osnoise.h
+++ b/include/trace/events/osnoise.h
@@ -6,6 +6,8 @@
 #define _OSNOISE_TRACE_H
 
 #include <linux/tracepoint.h>
+TRACE_DEFINE_ENUM(TASK_COMM_LEN);
+
 TRACE_EVENT(thread_noise,
 
 	TP_PROTO(struct task_struct *t, u64 start, u64 duration),
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index fbb99a6..57ec09e 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -216,6 +216,7 @@ static inline long __trace_sched_switch_state(bool preempt,
 }
 #endif /* CREATE_TRACE_POINTS */
 
+TRACE_DEFINE_ENUM(TASK_COMM_LEN);
 /*
  * Tracepoint for task switches, performed by the scheduler:
  */
diff --git a/include/trace/events/signal.h b/include/trace/events/signal.h
index 1db7e4b..3b1cdb6 100644
--- a/include/trace/events/signal.h
+++ b/include/trace/events/signal.h
@@ -9,6 +9,8 @@
 #include <linux/sched.h>
 #include <linux/tracepoint.h>
 
+TRACE_DEFINE_ENUM(TASK_COMM_LEN);
+
 #define TP_STORE_SIGINFO(__entry, info)				\
 	do {							\
 		if (info == SEND_SIG_NOINFO) {			\
diff --git a/include/trace/events/task.h b/include/trace/events/task.h
index 64d1609..0a9e03a7 100644
--- a/include/trace/events/task.h
+++ b/include/trace/events/task.h
@@ -6,6 +6,7 @@
 #define _TRACE_TASK_H
 #include <linux/tracepoint.h>
 
+TRACE_DEFINE_ENUM(TASK_COMM_LEN);
 TRACE_EVENT(task_newtask,
 
 	TP_PROTO(struct task_struct *task, unsigned long clone_flags),