diff --git a/tools/perf/util/arm-spe.c b/tools/perf/util/arm-spe.c
index 9561951a0055..614ce032f87e 100644
--- a/tools/perf/util/arm-spe.c
+++ b/tools/perf/util/arm-spe.c
@@ -1733,10 +1733,7 @@ arm_spe_synth_events(struct arm_spe *spe, struct perf_session *session)
 	attr.sample_period = spe->synth_opts.period;
 
 	/* create new id val to be a fixed offset from evsel id */
-	id = evsel->core.id[0] + 1000000000;
-
-	if (!id)
-		id = 1;
+	id = auxtrace_synth_id_range_start(evsel);
 
 	if (spe->synth_opts.flc) {
 		spe->sample_flc = true;
diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
index 1539c1dc823c..35f4745f6b2b 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -62,6 +62,22 @@
 #include <internal/lib.h>
 #include "util/sample.h"
 
+#define AUXTRACE_SYNTH_EVENT_ID_OFFSET	1000000000ULL
+
+/*
+ * Event IDs are allocated sequentially, so a big offset from any
+ * existing ID will reach a unused range.
+ */
+u64 auxtrace_synth_id_range_start(struct evsel *evsel)
+{
+	u64 id = evsel->core.id[0] + AUXTRACE_SYNTH_EVENT_ID_OFFSET;
+
+	if (!id)
+		id = 1;
+
+	return id;
+}
+
 /*
  * Make a group from 'leader' to 'last', requiring that the events were not
  * already grouped to a different leader.
diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
index e0a5b39fed12..ed3a1aaaf5d9 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h
@@ -648,6 +648,7 @@ void auxtrace__free_events(struct perf_session *session);
 void auxtrace__free(struct perf_session *session);
 bool auxtrace__evsel_is_auxtrace(struct perf_session *session,
 				 struct evsel *evsel);
+u64 auxtrace_synth_id_range_start(struct evsel *evsel);
 
 #define ITRACE_HELP \
 "				i[period]:    		synthesize instructions events\n" \
diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 30f4bb3e7fa3..62812bef1edf 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -1726,10 +1726,7 @@ static int cs_etm__synth_events(struct cs_etm_auxtrace *etm,
 	attr.read_format = evsel->core.attr.read_format;
 
 	/* create new id val to be a fixed offset from evsel id */
-	id = evsel->core.id[0] + 1000000000;
-
-	if (!id)
-		id = 1;
+	id = auxtrace_synth_id_range_start(evsel);
 
 	if (etm->synth_opts.branches) {
 		attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
diff --git a/tools/perf/util/intel-bts.c b/tools/perf/util/intel-bts.c
index 3625c6224750..382255393fb3 100644
--- a/tools/perf/util/intel-bts.c
+++ b/tools/perf/util/intel-bts.c
@@ -777,9 +777,7 @@ static int intel_bts_synth_events(struct intel_bts *bts,
 	attr.sample_id_all = evsel->core.attr.sample_id_all;
 	attr.read_format = evsel->core.attr.read_format;
 
-	id = evsel->core.id[0] + 1000000000;
-	if (!id)
-		id = 1;
+	id = auxtrace_synth_id_range_start(evsel);
 
 	if (bts->synth_opts.branches) {
 		attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 9b1011fe4826..fc9eec8b54b8 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -3987,9 +3987,7 @@ static int intel_pt_synth_events(struct intel_pt *pt,
 	attr.sample_id_all = evsel->core.attr.sample_id_all;
 	attr.read_format = evsel->core.attr.read_format;
 
-	id = evsel->core.id[0] + 1000000000;
-	if (!id)
-		id = 1;
+	id = auxtrace_synth_id_range_start(evsel);
 
 	if (pt->synth_opts.branches) {
 		attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
diff --git a/tools/perf/util/powerpc-vpadtl.c b/tools/perf/util/powerpc-vpadtl.c
index 39a3fb3f1330..bfa4156d7a97 100644
--- a/tools/perf/util/powerpc-vpadtl.c
+++ b/tools/perf/util/powerpc-vpadtl.c
@@ -656,9 +656,7 @@ powerpc_vpadtl_synth_events(struct powerpc_vpadtl *vpa, struct perf_session *ses
 	attr.config = PERF_SYNTH_POWERPC_VPA_DTL;
 
 	/* create new id val to be a fixed offset from evsel id */
-	id = evsel->core.id[0] + 1000000000;
-	if (!id)
-		id = 1;
+	id = auxtrace_synth_id_range_start(evsel);
 
 	err = perf_session__deliver_synth_attr_event(session, &attr, id);
 	if (err)