diff --git a/src/core/thread/mle_constants.hpp b/src/core/thread/mle_constants.hpp
index 77b0c8512..2378b2396 100644
--- a/src/core/thread/mle_constants.hpp
+++ b/src/core/thread/mle_constants.hpp
@@ -85,7 +85,7 @@ enum
     kParentRouteToLeaderTimeout = 20,   ///< PARENT_ROUTE_TO_LEADER_TIMEOUT (seconds)
     kRouterSelectionJitter      = 120,  ///< ROUTER_SELECTION_JITTER (seconds)
     kRouterDowngradeThreshold   = 23,   ///< ROUTER_DOWNGRADE_THRESHOLD (routers)
-    kRouterUpgradeThreadhold    = 16,   ///< ROUTER_UPGRADE_THRESHOLD (routers)
+    kRouterUpgradeThreshold     = 16,   ///< ROUTER_UPGRADE_THRESHOLD (routers)
     kMaxLeaderToRouterTimeout   = 90,   ///< INFINITE_COST_TIMEOUT (seconds)
     kReedAdvertiseInterval      = 570,  ///< REED_ADVERTISEMENT_INTERVAL (seconds)
     kReedAdvertiseJitter        = 60,   ///< REED_ADVERTISEMENT_JITTER (seconds)
diff --git a/src/core/thread/mle_router.cpp b/src/core/thread/mle_router.cpp
index 3ada3f980..b70f90a32 100644
--- a/src/core/thread/mle_router.cpp
+++ b/src/core/thread/mle_router.cpp
@@ -62,7 +62,7 @@ MleRouter::MleRouter(ThreadNetif &aThreadNetif):
     memset(mRouters, 0, sizeof(mRouters));
 
     mNetworkIdTimeout = kNetworkIdTimeout;
-    mRouterUpgradeThreshold = kRouterUpgradeThreadhold;
+    mRouterUpgradeThreshold = kRouterUpgradeThreshold;
     mLeaderWeight = 0;
     mRouterId = kMaxRouterId;
     mPreviousRouterId = kMaxRouterId;