diff --git a/webrtc/api/dtlsidentitystore.cc b/webrtc/api/dtlsidentitystore.cc
index 31c9bc0543..a485188065 100644
--- a/webrtc/api/dtlsidentitystore.cc
+++ b/webrtc/api/dtlsidentitystore.cc
@@ -122,13 +122,13 @@ DtlsIdentityStoreImpl::~DtlsIdentityStoreImpl() {
 }
 
 void DtlsIdentityStoreImpl::RequestIdentity(
-    rtc::KeyParams key_params,
-    rtc::Optional<uint64_t> expires,
+    const rtc::KeyParams& key_params,
+    const rtc::Optional<uint64_t>& expires_ms,
     const rtc::scoped_refptr<DtlsIdentityRequestObserver>& observer) {
   RTC_DCHECK(signaling_thread_->IsCurrent());
   RTC_DCHECK(observer);
 
-  // Dropping parameterization and |expires|.
+  // Dropping parameterization and |expires_ms|.
   // TODO(hbos,torbjorng): Use parameterizaton/expiration. webrtc:5092.
   GenerateIdentity(key_params.type(), observer);
 }
diff --git a/webrtc/api/dtlsidentitystore.h b/webrtc/api/dtlsidentitystore.h
index 8666b3cf3d..af4229201c 100644
--- a/webrtc/api/dtlsidentitystore.h
+++ b/webrtc/api/dtlsidentitystore.h
@@ -70,8 +70,8 @@ class DtlsIdentityStoreInterface {
     RequestIdentity(key_params, rtc::Optional<uint64_t>(), observer);
   }
   virtual void RequestIdentity(
-      rtc::KeyParams key_params,
-      rtc::Optional<uint64_t> expires,
+      const rtc::KeyParams& key_params,
+      const rtc::Optional<uint64_t>& expires_ms,
       const rtc::scoped_refptr<DtlsIdentityRequestObserver>& observer) {
     // Drop |expires|.
     RequestIdentity(key_params, observer);
@@ -91,8 +91,8 @@ class DtlsIdentityStoreImpl : public DtlsIdentityStoreInterface,
 
   // DtlsIdentityStoreInterface override;
   void RequestIdentity(
-      rtc::KeyParams key_params,
-      rtc::Optional<uint64_t> expires,
+      const rtc::KeyParams& key_params,
+      const rtc::Optional<uint64_t>& expires_ms,
       const rtc::scoped_refptr<DtlsIdentityRequestObserver>& observer) override;
 
   // rtc::MessageHandler override;
diff --git a/webrtc/api/peerconnectionfactory.cc b/webrtc/api/peerconnectionfactory.cc
index 4d8125fe8b..40e845f4d6 100644
--- a/webrtc/api/peerconnectionfactory.cc
+++ b/webrtc/api/peerconnectionfactory.cc
@@ -46,11 +46,11 @@ class DtlsIdentityStoreWrapper : public DtlsIdentityStoreInterface {
   }
 
   void RequestIdentity(
-      rtc::KeyParams key_params,
-      rtc::Optional<uint64_t> expires,
+      const rtc::KeyParams& key_params,
+      const rtc::Optional<uint64_t>& expires_ms,
       const rtc::scoped_refptr<webrtc::DtlsIdentityRequestObserver>&
           observer) override {
-    store_->RequestIdentity(key_params, expires, observer);
+    store_->RequestIdentity(key_params, expires_ms, observer);
   }
 
  private:
diff --git a/webrtc/api/test/fakedtlsidentitystore.h b/webrtc/api/test/fakedtlsidentitystore.h
index 7c8a4fc71f..8bbffbf93e 100644
--- a/webrtc/api/test/fakedtlsidentitystore.h
+++ b/webrtc/api/test/fakedtlsidentitystore.h
@@ -96,14 +96,15 @@ class FakeDtlsIdentityStore : public webrtc::DtlsIdentityStoreInterface,
   void use_alternate_key() { key_index_ = 1; }
 
   void RequestIdentity(
-      rtc::KeyParams key_params,
-      rtc::Optional<uint64_t> expires,
+      const rtc::KeyParams& key_params,
+      const rtc::Optional<uint64_t>& expires_ms,
       const rtc::scoped_refptr<webrtc::DtlsIdentityRequestObserver>&
           observer) override {
     // TODO(hbos): Should be able to generate KT_ECDSA too.
     RTC_DCHECK((key_params.type() == rtc::KT_RSA &&
                 key_params.rsa_params().mod_size == 1024 &&
-                key_params.rsa_params().pub_exp == 0x10001) ||
+                key_params.rsa_params().pub_exp == 0x10001 &&
+                !expires_ms) ||
                should_fail_);
     MessageData* msg = new MessageData(
         rtc::scoped_refptr<webrtc::DtlsIdentityRequestObserver>(observer));