diff --git a/src/core/mac/mac.cpp b/src/core/mac/mac.cpp
index 559c7d012..e5eda455b 100644
--- a/src/core/mac/mac.cpp
+++ b/src/core/mac/mac.cpp
@@ -349,13 +349,10 @@ const ExtAddress *Mac::GetExtAddress(void) const
     return &mExtAddress;
 }
 
-ThreadError Mac::SetExtAddress(const ExtAddress &aExtAddress)
+void Mac::SetExtAddress(const ExtAddress &aExtAddress)
 {
-    ThreadError error = kThreadError_None;
     uint8_t buf[sizeof(aExtAddress)];
 
-    VerifyOrExit(!aExtAddress.IsGroup(), error = kThreadError_InvalidArgs);
-
     for (size_t i = 0; i < sizeof(buf); i++)
     {
         buf[i] = aExtAddress.m8[7 - i];
@@ -363,9 +360,6 @@ ThreadError Mac::SetExtAddress(const ExtAddress &aExtAddress)
 
     otPlatRadioSetExtendedAddress(mNetif.GetInstance(), buf);
     mExtAddress = aExtAddress;
-
-exit:
-    return error;
 }
 
 void Mac::GetHashMacAddress(ExtAddress *aHashMacAddress)
diff --git a/src/core/mac/mac.hpp b/src/core/mac/mac.hpp
index a9d8bce21..95a5d6f1a 100644
--- a/src/core/mac/mac.hpp
+++ b/src/core/mac/mac.hpp
@@ -294,10 +294,8 @@ public:
      *
      * @param[in]  aExtAddress  A reference to the IEEE 802.15.4 Extended Address.
      *
-     * @retval kThreadError_None  Successfully set the IEEE 802.15.4 Extended Address.
-     *
      */
-    ThreadError SetExtAddress(const ExtAddress &aExtAddress);
+    void SetExtAddress(const ExtAddress &aExtAddress);
 
     /**
      * This method gets the Hash Mac Address.
diff --git a/src/core/openthread.cpp b/src/core/openthread.cpp
index a251fa056..cff550c21 100644
--- a/src/core/openthread.cpp
+++ b/src/core/openthread.cpp
@@ -141,8 +141,8 @@ ThreadError otSetExtendedAddress(otInstance *aInstance, const otExtAddress *aExt
 
     VerifyOrExit(aExtAddress != NULL, error = kThreadError_InvalidArgs);
 
-    SuccessOrExit(error = aInstance->mThreadNetif.GetMac().SetExtAddress(*static_cast<const Mac::ExtAddress *>
-                                                                         (aExtAddress)));
+    aInstance->mThreadNetif.GetMac().SetExtAddress(*static_cast<const Mac::ExtAddress *>(aExtAddress));
+
     SuccessOrExit(error = aInstance->mThreadNetif.GetMle().UpdateLinkLocalAddress());
 
 exit: