diff --git a/pc/data_channel_controller.cc b/pc/data_channel_controller.cc
index 832eb03f79..a9fa3dabb9 100644
--- a/pc/data_channel_controller.cc
+++ b/pc/data_channel_controller.cc
@@ -359,16 +359,6 @@ void DataChannelController::OnTransportChannelClosed(RTCError error) {
   }
 }
 
-SctpDataChannel* DataChannelController::FindDataChannelBySid(int sid) const {
-  RTC_DCHECK_RUN_ON(signaling_thread());
-  for (const auto& channel : sctp_data_channels_) {
-    if (channel->id() == sid) {
-      return channel;
-    }
-  }
-  return nullptr;
-}
-
 DataChannelTransportInterface* DataChannelController::data_channel_transport()
     const {
   // TODO(bugs.webrtc.org/11547): Only allow this accessor to be called on the
diff --git a/pc/data_channel_controller.h b/pc/data_channel_controller.h
index a3efe41ad0..56a9435f9e 100644
--- a/pc/data_channel_controller.h
+++ b/pc/data_channel_controller.h
@@ -87,8 +87,6 @@ class DataChannelController : public SctpDataChannelProviderInterface,
           config) /* RTC_RUN_ON(signaling_thread()) */;
   void AllocateSctpSids(rtc::SSLRole role);
 
-  SctpDataChannel* FindDataChannelBySid(int sid) const;
-
   // Checks if any data channel has been added.
   bool HasDataChannels() const;
   bool HasSctpDataChannels() const {
diff --git a/pc/peer_connection.cc b/pc/peer_connection.cc
index 1a17fd4368..0705c84a97 100644
--- a/pc/peer_connection.cc
+++ b/pc/peer_connection.cc
@@ -2027,10 +2027,6 @@ void PeerConnection::OnSctpDataChannelClosed(DataChannelInterface* channel) {
       static_cast<SctpDataChannel*>(channel));
 }
 
-SctpDataChannel* PeerConnection::FindDataChannelBySid(int sid) const {
-  return data_channel_controller_.FindDataChannelBySid(sid);
-}
-
 PeerConnection::InitializePortAllocatorResult
 PeerConnection::InitializePortAllocator_n(
     const cricket::ServerAddresses& stun_servers,
diff --git a/pc/peer_connection.h b/pc/peer_connection.h
index 6ada0c0683..919d377b2b 100644
--- a/pc/peer_connection.h
+++ b/pc/peer_connection.h
@@ -494,11 +494,6 @@ class PeerConnection : public PeerConnectionInternal,
 
   void OnNegotiationNeeded();
 
-  // Returns the specified SCTP DataChannel in sctp_data_channels_,
-  // or nullptr if not found.
-  SctpDataChannel* FindDataChannelBySid(int sid) const
-      RTC_RUN_ON(signaling_thread());
-
   // Called when first configuring the port allocator.
   struct InitializePortAllocatorResult {
     bool enable_ipv6;