diff --git a/test/i420_video_source.h b/test/i420_video_source.h
index f4717647b622ff6135374d0a9c85c5bae52eaaac..c7362d2b52a613da14acf281fc5952d718c1c7fe 100644
--- a/test/i420_video_source.h
+++ b/test/i420_video_source.h
@@ -28,6 +28,9 @@ class I420VideoSource : public VideoSource {
         img_(NULL),
         start_(start),
         limit_(limit),
+        frame_(0),
+        width_(0),
+        height_(0),
         framerate_numerator_(rate_numerator),
         framerate_denominator_(rate_denominator) {