diff --git a/video/video_receive_stream.cc b/video/video_receive_stream.cc
index 2d99be690c..c495f4e5b9 100644
--- a/video/video_receive_stream.cc
+++ b/video/video_receive_stream.cc
@@ -348,9 +348,13 @@ void VideoReceiveStream::Start() {
 
     std::string decoded_output_file =
         field_trial::FindFullName("WebRTC-DecoderDataDumpDirectory");
-    // Because '/' can't be used inside a field trial parameter, we use ':'
+    // Because '/' can't be used inside a field trial parameter, we use ';'
     // instead.
-    absl::c_replace(decoded_output_file, ':', '/');
+    // This is only relevant to WebRTC-DecoderDataDumpDirectory
+    // field trial. ';' is chosen arbitrary. Even though it's a legal character
+    // in some file systems, we can sacrifice ability to use it in the path to
+    // dumped video, since it's developers-only feature for debugging.
+    absl::c_replace(decoded_output_file, ';', '/');
     if (!decoded_output_file.empty()) {
       char filename_buffer[256];
       rtc::SimpleStringBuilder ssb(filename_buffer);