diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 5d353e7..71bc608 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -100,6 +100,7 @@
 	self->repipe = repipe;
 	self->ordered_samples.flush_limit = ULLONG_MAX;
 	INIT_LIST_HEAD(&self->ordered_samples.samples_head);
+	machine__init(&self->host_machine, "", HOST_KERNEL_ID);
 
 	if (mode == O_RDONLY) {
 		if (perf_session__open(self, force) < 0)
@@ -870,3 +871,10 @@
 
 	return 0;
 }
+
+size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
+{
+	return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
+	       __dsos__fprintf(&self->host_machine.user_dsos, fp) +
+	       machines__fprintf_dsos(&self->machines, fp);
+}