diff --git a/api/jsep.h b/api/jsep.h
index 7ef4c5364f..dcf821369e 100644
--- a/api/jsep.h
+++ b/api/jsep.h
@@ -139,7 +139,7 @@ class RTC_EXPORT SessionDescriptionInterface {
   // Create a new SessionDescriptionInterface object
   // with the same values as the old object.
   // TODO(bugs.webrtc.org:12215): Remove default implementation
-  virtual std::unique_ptr<SessionDescriptionInterface> Clone() {
+  virtual std::unique_ptr<SessionDescriptionInterface> Clone() const {
     return nullptr;
   }
 
diff --git a/api/jsep_session_description.h b/api/jsep_session_description.h
index 0ba3807026..e13d85e71c 100644
--- a/api/jsep_session_description.h
+++ b/api/jsep_session_description.h
@@ -49,7 +49,7 @@ class JsepSessionDescription : public SessionDescriptionInterface {
                   const std::string& session_id,
                   const std::string& session_version);
 
-  virtual std::unique_ptr<SessionDescriptionInterface> Clone();
+  virtual std::unique_ptr<SessionDescriptionInterface> Clone() const;
 
   virtual cricket::SessionDescription* description() {
     return description_.get();
diff --git a/pc/jsep_session_description.cc b/pc/jsep_session_description.cc
index 2334e92b9a..e0b23110a1 100644
--- a/pc/jsep_session_description.cc
+++ b/pc/jsep_session_description.cc
@@ -215,7 +215,8 @@ bool JsepSessionDescription::Initialize(
   return true;
 }
 
-std::unique_ptr<SessionDescriptionInterface> JsepSessionDescription::Clone() {
+std::unique_ptr<SessionDescriptionInterface> JsepSessionDescription::Clone()
+    const {
   auto new_description = std::make_unique<JsepSessionDescription>(type_);
   new_description->Initialize(description_->Clone(), session_id_,
                               session_version_);