diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
index 83723ba11dc8591b2bd33a0da63a2d61ecffcbd8..011da3924fc1159e35e75e4e80578a4005b4f998 100644
--- a/tools/perf/util/dso.h
+++ b/tools/perf/util/dso.h
@@ -193,7 +193,7 @@ struct dso {
 		int		 fd;
 		int		 status;
 		u32		 status_seen;
-		size_t		 file_size;
+		u64		 file_size;
 		struct list_head open_entry;
 		u64		 debug_frame_offset;
 		u64		 eh_frame_hdr_offset;