diff --git a/tools/perf/tests/hwmon_pmu.c b/tools/perf/tests/hwmon_pmu.c
index d2b066a2b557..0837aca1cdfa 100644
--- a/tools/perf/tests/hwmon_pmu.c
+++ b/tools/perf/tests/hwmon_pmu.c
@@ -13,17 +13,23 @@
 static const struct test_event {
 	const char *name;
 	const char *alias;
-	long config;
+	union hwmon_pmu_event_key key;
 } test_events[] = {
 	{
 		"temp_test_hwmon_event1",
 		"temp1",
-		0xA0001,
+		.key = {
+			.num = 1,
+			.type = 10
+		},
 	},
 	{
 		"temp_test_hwmon_event2",
 		"temp2",
-		0xA0002,
+		.key = {
+			.num = 2,
+			.type = 10
+		},
 	},
 };
 
@@ -183,11 +189,11 @@ static int do_test(size_t i, bool with_pmu, bool with_alias)
 		    strcmp(evsel->pmu->name, "hwmon_a_test_hwmon_pmu"))
 			continue;
 
-		if (evsel->core.attr.config != (u64)test_events[i].config) {
+		if (evsel->core.attr.config != (u64)test_events[i].key.type_and_num) {
 			pr_debug("FAILED %s:%d Unexpected config for '%s', %lld != %ld\n",
 				__FILE__, __LINE__, str,
 				evsel->core.attr.config,
-				test_events[i].config);
+				test_events[i].key.type_and_num);
 			ret = TEST_FAIL;
 			goto out;
 		}
diff --git a/tools/perf/util/hwmon_pmu.c b/tools/perf/util/hwmon_pmu.c
index 4acb9bb19b84..acd889b2462f 100644
--- a/tools/perf/util/hwmon_pmu.c
+++ b/tools/perf/util/hwmon_pmu.c
@@ -107,20 +107,6 @@ struct hwmon_pmu {
 	int hwmon_dir_fd;
 };
 
-/**
- * union hwmon_pmu_event_key: Key for hwmon_pmu->events as such each key
- * represents an event.
- *
- * Related hwmon files start <type><number> that this key represents.
- */
-union hwmon_pmu_event_key {
-	long type_and_num;
-	struct {
-		int num :16;
-		enum hwmon_type type :8;
-	};
-};
-
 /**
  * struct hwmon_pmu_event_value: Value in hwmon_pmu->events.
  *
diff --git a/tools/perf/util/hwmon_pmu.h b/tools/perf/util/hwmon_pmu.h
index 882566846df4..b3329774d2b2 100644
--- a/tools/perf/util/hwmon_pmu.h
+++ b/tools/perf/util/hwmon_pmu.h
@@ -91,6 +91,22 @@ enum hwmon_item {
 	HWMON_ITEM__MAX,
 };
 
+/**
+ * union hwmon_pmu_event_key: Key for hwmon_pmu->events as such each key
+ * represents an event.
+ * union is exposed for testing to ensure problems are avoided on big
+ * endian machines.
+ *
+ * Related hwmon files start <type><number> that this key represents.
+ */
+union hwmon_pmu_event_key {
+	long type_and_num;
+	struct {
+		int num :16;
+		enum hwmon_type type :8;
+	};
+};
+
 bool perf_pmu__is_hwmon(const struct perf_pmu *pmu);
 bool evsel__is_hwmon(const struct evsel *evsel);