diff --git a/src/core/thread/router_table.cpp b/src/core/thread/router_table.cpp
index 32d7d8713..4e3499d41 100644
--- a/src/core/thread/router_table.cpp
+++ b/src/core/thread/router_table.cpp
@@ -395,24 +395,6 @@ exit:
     return router;
 }
 
-Router *RouterTable::GetRouter(uint8_t aRouterId)
-{
-    Router * rval   = NULL;
-    uint16_t rloc16 = Mle::Mle::GetRloc16(aRouterId);
-
-    for (uint8_t i = 0; i < Mle::kMaxRouters; i++)
-    {
-        if (mRouters[i].GetRloc16() == rloc16)
-        {
-            rval = &mRouters[i];
-            ExitNow();
-        }
-    }
-
-exit:
-    return rval;
-}
-
 const Router *RouterTable::GetRouter(uint8_t aRouterId) const
 {
     const Router *rval   = NULL;
diff --git a/src/core/thread/router_table.hpp b/src/core/thread/router_table.hpp
index d1aa74f39..7e63973af 100644
--- a/src/core/thread/router_table.hpp
+++ b/src/core/thread/router_table.hpp
@@ -238,7 +238,10 @@ public:
      * @returns A pointer to the router or NULL if the router could not be found.
      *
      */
-    Router *GetRouter(uint8_t aRouterId);
+    Router *GetRouter(uint8_t aRouterId)
+    {
+        return const_cast<Router *>(const_cast<const RouterTable *>(this)->GetRouter(aRouterId));
+    }
 
     /**
      * This method returns the router for a given router id.