diff --git a/contrib/pg_prewarm/autoprewarm.c b/contrib/pg_prewarm/autoprewarm.c
index c8d673a20e..1843b1862e 100644
--- a/contrib/pg_prewarm/autoprewarm.c
+++ b/contrib/pg_prewarm/autoprewarm.c
@@ -193,8 +193,8 @@ autoprewarm_main(Datum main_arg)
 	{
 		LWLockRelease(&apw_state->lock);
 		ereport(LOG,
-				(errmsg("autoprewarm worker is already running under PID %lu",
-						(unsigned long) apw_state->bgworker_pid)));
+				(errmsg("autoprewarm worker is already running under PID %d",
+						(int) apw_state->bgworker_pid)));
 		return;
 	}
 	apw_state->bgworker_pid = MyProcPid;
@@ -303,8 +303,8 @@ apw_load_buffers(void)
 	{
 		LWLockRelease(&apw_state->lock);
 		ereport(LOG,
-				(errmsg("skipping prewarm because block dump file is being written by PID %lu",
-						(unsigned long) apw_state->pid_using_dumpfile)));
+				(errmsg("skipping prewarm because block dump file is being written by PID %d",
+						(int) apw_state->pid_using_dumpfile)));
 		return;
 	}
 	LWLockRelease(&apw_state->lock);
@@ -599,12 +599,12 @@ apw_dump_now(bool is_bgworker, bool dump_unlogged)
 	{
 		if (!is_bgworker)
 			ereport(ERROR,
-					(errmsg("could not perform block dump because dump file is being used by PID %lu",
-							(unsigned long) apw_state->pid_using_dumpfile)));
+					(errmsg("could not perform block dump because dump file is being used by PID %d",
+							(int) apw_state->pid_using_dumpfile)));
 
 		ereport(LOG,
-				(errmsg("skipping block dump because it is already being performed by PID %lu",
-						(unsigned long) apw_state->pid_using_dumpfile)));
+				(errmsg("skipping block dump because it is already being performed by PID %d",
+						(int) apw_state->pid_using_dumpfile)));
 		return 0;
 	}
 
@@ -737,8 +737,8 @@ autoprewarm_start_worker(PG_FUNCTION_ARGS)
 	if (pid != InvalidPid)
 		ereport(ERROR,
 				(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
-				 errmsg("autoprewarm worker is already running under PID %lu",
-						(unsigned long) pid)));
+				 errmsg("autoprewarm worker is already running under PID %d",
+						(int) pid)));
 
 	apw_start_leader_worker();
 
diff --git a/src/backend/postmaster/bgworker.c b/src/backend/postmaster/bgworker.c
index 8dd7d64630..0d72de24b0 100644
--- a/src/backend/postmaster/bgworker.c
+++ b/src/backend/postmaster/bgworker.c
@@ -389,8 +389,8 @@ BackgroundWorkerStateChange(bool allow_new_workers)
 		rw->rw_worker.bgw_notify_pid = slot->worker.bgw_notify_pid;
 		if (!PostmasterMarkPIDForWorkerNotify(rw->rw_worker.bgw_notify_pid))
 		{
-			elog(DEBUG1, "worker notification PID %ld is not valid",
-				 (long) rw->rw_worker.bgw_notify_pid);
+			elog(DEBUG1, "worker notification PID %d is not valid",
+				 (int) rw->rw_worker.bgw_notify_pid);
 			rw->rw_worker.bgw_notify_pid = 0;
 		}
 
diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c
index 21a9fc0fdd..7767657f27 100644
--- a/src/backend/storage/ipc/procsignal.c
+++ b/src/backend/storage/ipc/procsignal.c
@@ -416,8 +416,8 @@ WaitForProcSignalBarrier(uint64 generation)
 											5000,
 											WAIT_EVENT_PROC_SIGNAL_BARRIER))
 				ereport(LOG,
-						(errmsg("still waiting for backend with PID %lu to accept ProcSignalBarrier",
-								(unsigned long) slot->pss_pid)));
+						(errmsg("still waiting for backend with PID %d to accept ProcSignalBarrier",
+								(int) slot->pss_pid)));
 			oldval = pg_atomic_read_u64(&slot->pss_barrierGeneration);
 		}
 		ConditionVariableCancelSleep();