diff --git a/third_party/libwebm/README.libvpx b/third_party/libwebm/README.libvpx
index 8839257d601b7a8b5514b80c522abccccd24da34..91875e11a321958e5a5faf5d068da1dc4458bac7 100644
--- a/third_party/libwebm/README.libvpx
+++ b/third_party/libwebm/README.libvpx
@@ -1,5 +1,5 @@
 URL: https://chromium.googlesource.com/webm/libwebm
-Version: b6de61a5c0d441c91afb0785e3b26efd2f9e7337
+Version: 2dec09426ab62b794464cc9971bd135b4d313e65
 License: BSD
 License File: LICENSE.txt
 
diff --git a/third_party/libwebm/mkvparser.cpp b/third_party/libwebm/mkvparser.cpp
index 9d4ddc893f152dc61a93c1df0f6a58e2e552ec8d..fc01be526409dafd5c1b6e4c173f052d5fbf2dab 100644
--- a/third_party/libwebm/mkvparser.cpp
+++ b/third_party/libwebm/mkvparser.cpp
@@ -23,7 +23,7 @@ void mkvparser::GetVersion(int& major, int& minor, int& build, int& revision) {
   major = 1;
   minor = 0;
   build = 0;
-  revision = 29;
+  revision = 30;
 }
 
 long long mkvparser::ReadUInt(IMkvReader* pReader, long long pos, long& len) {
@@ -219,8 +219,8 @@ long mkvparser::UnserializeFloat(IMkvReader* pReader, long long pos,
   return 0;
 }
 
-long mkvparser::UnserializeInt(IMkvReader* pReader, long long pos, long size,
-                               long long& result) {
+long mkvparser::UnserializeInt(IMkvReader* pReader, long long pos,
+                               long long size, long long& result) {
   assert(pReader);
   assert(pos >= 0);
   assert(size > 0);
diff --git a/third_party/libwebm/mkvparser.hpp b/third_party/libwebm/mkvparser.hpp
index ebb69559ff18dac289ed0c7a2ccb60337945cf9c..aa0b43267d63b9f0e7a915ffd7a1164fa9d11e49 100644
--- a/third_party/libwebm/mkvparser.hpp
+++ b/third_party/libwebm/mkvparser.hpp
@@ -32,7 +32,8 @@ long long ReadUInt(IMkvReader*, long long, long&);
 long long UnserializeUInt(IMkvReader*, long long pos, long long size);
 
 long UnserializeFloat(IMkvReader*, long long pos, long long size, double&);
-long UnserializeInt(IMkvReader*, long long pos, long len, long long& result);
+long UnserializeInt(IMkvReader*, long long pos, long long size,
+                    long long& result);
 
 long UnserializeString(IMkvReader*, long long pos, long long size, char*& str);