diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 604e14f..1951e33 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -384,7 +384,7 @@
 
 	perf_event_ops__fill_defaults(ops);
 
-	page_size = getpagesize();
+	page_size = sysconf(_SC_PAGESIZE);
 
 	head = self->header.data_offset;
 
diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
index 407fd65..5ea8973 100644
--- a/tools/perf/util/trace-event-info.c
+++ b/tools/perf/util/trace-event-info.c
@@ -515,7 +515,7 @@
 	write_or_die(buf, 1);
 
 	/* save page_size */
-	page_size = getpagesize();
+	page_size = sysconf(_SC_PAGESIZE);
 	write_or_die(&page_size, 4);
 
 	read_header_files();