diff --git a/src/core/net/ip6_address.cpp b/src/core/net/ip6_address.cpp
index d2fb84e3c..afe61a666 100644
--- a/src/core/net/ip6_address.cpp
+++ b/src/core/net/ip6_address.cpp
@@ -161,9 +161,9 @@ void Address::SetIid(const uint8_t *aIid)
     memcpy(mFields.m8 + kInterfaceIdentifierOffset, aIid, kInterfaceIdentifierSize);
 }
 
-void Address::SetIid(const Mac::ExtAddress &aEui64)
+void Address::SetIid(const Mac::ExtAddress &aExtAddress)
 {
-    memcpy(mFields.m8 + kInterfaceIdentifierOffset, aEui64.m8, kInterfaceIdentifierSize);
+    memcpy(mFields.m8 + kInterfaceIdentifierOffset, aExtAddress.m8, kInterfaceIdentifierSize);
     mFields.m8[kInterfaceIdentifierOffset] ^= 0x02;
 }
 
diff --git a/src/core/net/ip6_address.hpp b/src/core/net/ip6_address.hpp
index 8da0f0be2..44a8f955b 100644
--- a/src/core/net/ip6_address.hpp
+++ b/src/core/net/ip6_address.hpp
@@ -297,10 +297,10 @@ public:
     /**
      * This method sets the Interface Identifier.
      *
-     * @param[in]  aEui64  A reference to the IEEE EUI-64 address.
+     * @param[in]  aExtAddress  A reference to the extended address.
      *
      */
-    void SetIid(const Mac::ExtAddress &aEui64);
+    void SetIid(const Mac::ExtAddress &aExtAddress);
 
     /**
      * This method converts the IPv6 Interface Identifier to an IEEE 802.15.4 Extended Address.