diff --git a/tools/lib/perf/mmap.c b/tools/lib/perf/mmap.c
index c1a51d925e0e..ec124eb0ec0a 100644
--- a/tools/lib/perf/mmap.c
+++ b/tools/lib/perf/mmap.c
@@ -508,7 +508,7 @@ int perf_mmap__read_self(struct perf_mmap *map, struct perf_counts_values *count
 		idx = READ_ONCE(pc->index);
 		cnt = READ_ONCE(pc->offset);
 		if (pc->cap_user_rdpmc && idx) {
-			s64 evcnt = read_perf_counter(idx - 1);
+			u64 evcnt = read_perf_counter(idx - 1);
 			u16 width = READ_ONCE(pc->pmc_width);
 
 			evcnt <<= 64 - width;