diff --git a/tools/valgrind-webrtc/tsan_v2/suppressions.txt b/tools/valgrind-webrtc/tsan_v2/suppressions.txt
new file mode 100644
index 000000000..c6ed649b2
--- /dev/null
+++ b/tools/valgrind-webrtc/tsan_v2/suppressions.txt
@@ -0,0 +1,3 @@
+# False positive in system wrappers.
+# See https://code.google.com/p/webrtc/issues/detail?id=300 for details.
+race:webrtc/system_wrappers/source/thread_posix.cc