diff --git a/modules/video_coding/codecs/vp9/libvpx_vp9_decoder.cc b/modules/video_coding/codecs/vp9/libvpx_vp9_decoder.cc
index 9f363ffdc1..40b4d8233c 100644
--- a/modules/video_coding/codecs/vp9/libvpx_vp9_decoder.cc
+++ b/modules/video_coding/codecs/vp9/libvpx_vp9_decoder.cc
@@ -127,6 +127,7 @@ bool LibvpxVp9Decoder::Configure(const Settings& settings) {
 
   if (decoder_ == nullptr) {
     decoder_ = new vpx_codec_ctx_t;
+    memset(decoder_, 0, sizeof(*decoder_));
   }
   vpx_codec_dec_cfg_t cfg;
   memset(&cfg, 0, sizeof(cfg));
diff --git a/modules/video_coding/codecs/vp9/libvpx_vp9_encoder.cc b/modules/video_coding/codecs/vp9/libvpx_vp9_encoder.cc
index cfb69fdb76..ebe4c1e33d 100644
--- a/modules/video_coding/codecs/vp9/libvpx_vp9_encoder.cc
+++ b/modules/video_coding/codecs/vp9/libvpx_vp9_encoder.cc
@@ -530,9 +530,11 @@ int LibvpxVp9Encoder::InitEncode(const VideoCodec* inst,
   }
   if (encoder_ == nullptr) {
     encoder_ = new vpx_codec_ctx_t;
+    memset(encoder_, 0, sizeof(*encoder_));
   }
   if (config_ == nullptr) {
     config_ = new vpx_codec_enc_cfg_t;
+    memset(config_, 0, sizeof(*config_));
   }
   timestamp_ = 0;
   if (&codec_ != inst) {