diff --git a/server/registry.go b/server/registry.go
index fa63b5027..75b0e98c9 100644
--- a/server/registry.go
+++ b/server/registry.go
@@ -46,7 +46,7 @@ func (r *Registry) Register(name string, peerVersion string, peerURL string, url
 	key := path.Join(RegistryKey, name)
 	value := fmt.Sprintf("raft=%s&etcd=%s&raftVersion=%s", peerURL, url, peerVersion)
 	_, err := r.store.Create(key, value, false, store.Permanent, commitIndex, term)
-	log.Debugf("Register: %s (%v)", name, err)
+	log.Debugf("Register: %s", name)
 	return err
 }
 
@@ -60,7 +60,7 @@ func (r *Registry) Unregister(name string, commitIndex uint64, term uint64) erro
 
 	// Remove the key from the store.
 	_, err := r.store.Delete(path.Join(RegistryKey, name), false, commitIndex, term)
-	log.Debugf("Unregister: %s (%v)", name, err)
+	log.Debugf("Unregister: %s", name)
 	return err
 }
 
diff --git a/store/compare_and_swap_command.go b/store/compare_and_swap_command.go
index c4bfee569..8ee119f36 100644
--- a/store/compare_and_swap_command.go
+++ b/store/compare_and_swap_command.go
@@ -16,8 +16,8 @@ type CompareAndSwapCommand struct {
 	Key        string    `json:"key"`
 	Value      string    `json:"value"`
 	ExpireTime time.Time `json:"expireTime"`
-	PrevValue  string    `json: prevValue`
-	PrevIndex  uint64    `json: prevIndex`
+	PrevValue  string    `json:"prevValue"`
+	PrevIndex  uint64    `json:"prevIndex"`
 }
 
 // The name of the testAndSet command in the log
diff --git a/store/stats.go b/store/stats.go
index 5f4d26d91..c18f5cbf0 100644
--- a/store/stats.go
+++ b/store/stats.go
@@ -41,7 +41,7 @@ type Stats struct {
 
 	// Number of create requests
 	CreateSuccess uint64 `json:"createSuccess"`
-	CreateFail    uint64 `json:createFail`
+	CreateFail    uint64 `json:"createFail"`
 
 	// Number of testAndSet requests
 	CompareAndSwapSuccess uint64 `json:"compareAndSwapSuccess"`
diff --git a/store/watcher_test.go b/store/watcher_test.go
index 61da92f7c..c3da475fc 100644
--- a/store/watcher_test.go
+++ b/store/watcher_test.go
@@ -9,7 +9,7 @@ func TestWatcher(t *testing.T) {
 	wh := s.WatcherHub
 	c, err := wh.watch("/foo", true, 1)
 	if err != nil {
-		t.Fatal("%v", err)
+		t.Fatalf("%v", err)
 	}
 
 	select {