diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c
index 3fcabfd8fca1..769b920d9250 100644
--- a/tools/perf/util/pmus.c
+++ b/tools/perf/util/pmus.c
@@ -69,7 +69,7 @@ size_t pmu_name_len_no_suffix(const char *str)
 
 int pmu_name_cmp(const char *lhs_pmu_name, const char *rhs_pmu_name)
 {
-	unsigned long lhs_num = 0, rhs_num = 0;
+	unsigned long long lhs_num = 0, rhs_num = 0;
 	size_t lhs_pmu_name_len = pmu_name_len_no_suffix(lhs_pmu_name);
 	size_t rhs_pmu_name_len = pmu_name_len_no_suffix(rhs_pmu_name);
 	int ret = strncmp(lhs_pmu_name, rhs_pmu_name,
@@ -79,9 +79,9 @@ int pmu_name_cmp(const char *lhs_pmu_name, const char *rhs_pmu_name)
 		return ret;
 
 	if (lhs_pmu_name_len + 1 < strlen(lhs_pmu_name))
-		lhs_num = strtoul(&lhs_pmu_name[lhs_pmu_name_len + 1], NULL, 16);
+		lhs_num = strtoull(&lhs_pmu_name[lhs_pmu_name_len + 1], NULL, 16);
 	if (rhs_pmu_name_len + 1 < strlen(rhs_pmu_name))
-		rhs_num = strtoul(&rhs_pmu_name[rhs_pmu_name_len + 1], NULL, 16);
+		rhs_num = strtoull(&rhs_pmu_name[rhs_pmu_name_len + 1], NULL, 16);
 
 	return lhs_num < rhs_num ? -1 : (lhs_num > rhs_num ? 1 : 0);
 }