diff --git a/libs/vr/libvrflinger/vr_flinger.cpp b/libs/vr/libvrflinger/vr_flinger.cpp
index a8a8476..de7d8f8 100644
--- a/libs/vr/libvrflinger/vr_flinger.cpp
+++ b/libs/vr/libvrflinger/vr_flinger.cpp
@@ -17,6 +17,7 @@
 #include <processgroup/sched_policy.h>
 #include <sys/prctl.h>
 #include <sys/resource.h>
+#include <utils/ThreadDefs.h>
 
 #include <functional>