diff --git a/third_party/angle/src/libANGLE/renderer/EGLReusableSync.h b/third_party/angle/src/libANGLE/renderer/EGLReusableSync.h
index 9c65fccad..12c972565 100644
--- a/third_party/angle/src/libANGLE/renderer/EGLReusableSync.h
+++ b/third_party/angle/src/libANGLE/renderer/EGLReusableSync.h
@@ -14,6 +14,8 @@
 
 #include "common/angleutils.h"
 
+#include <condition_variable>
+
 namespace rx
 {