diff --git a/function/service.go b/function/service.go
index 04f0191..ac59125 100644
--- a/function/service.go
+++ b/function/service.go
@@ -3,7 +3,7 @@ package function
 // Service represents service for managing functions.
 type Service interface {
 	RegisterFunction(fn *Function) (*Function, error)
-	UpdateFunction(space string, fn *Function) (*Function, error)
+	UpdateFunction(fn *Function) (*Function, error)
 	GetFunction(space string, id ID) (*Function, error)
 	GetFunctions(space string) (Functions, error)
 	DeleteFunction(space string, id ID) error
diff --git a/httpapi/httpapi.go b/httpapi/httpapi.go
index 6cafb5d..6e772c6 100644
--- a/httpapi/httpapi.go
+++ b/httpapi/httpapi.go
@@ -129,9 +129,9 @@ func (h HTTPAPI) updateFunction(w http.ResponseWriter, r *http.Request, params h
 		return
 	}
 
-	space := params.ByName("space")
+	fn.Space = params.ByName("space")
 	fn.ID = function.ID(params.ByName("id"))
-	output, err := h.Functions.UpdateFunction(space, fn)
+	output, err := h.Functions.UpdateFunction(fn)
 	if err != nil {
 		if _, ok := err.(*function.ErrFunctionValidation); ok {
 			w.WriteHeader(http.StatusBadRequest)
@@ -146,7 +146,7 @@ func (h HTTPAPI) updateFunction(w http.ResponseWriter, r *http.Request, params h
 		encoder.Encode(output)
 	}
 
-	metricFunctionUpdateRequests.WithLabelValues(space).Inc()
+	metricFunctionUpdateRequests.WithLabelValues(fn.Space).Inc()
 }
 
 func (h HTTPAPI) deleteFunction(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
diff --git a/libkv/function.go b/libkv/function.go
index 4f24ae3..5b53b8e 100644
--- a/libkv/function.go
+++ b/libkv/function.go
@@ -53,14 +53,14 @@ func (service Service) RegisterFunction(fn *function.Function) (*function.Functi
 }
 
 // UpdateFunction updates function configuration.
-func (service Service) UpdateFunction(space string, fn *function.Function) (*function.Function, error) {
-	_, err := service.FunctionStore.Get(FunctionKey{space, fn.ID}.String(), &store.ReadOptions{Consistent: true})
-	if err != nil {
-		return nil, &function.ErrFunctionNotFound{ID: fn.ID}
+func (service Service) UpdateFunction(fn *function.Function) (*function.Function, error) {
+	if err := service.validateFunction(fn); err != nil {
+		return nil, err
 	}
 
-	if err = service.validateFunction(fn); err != nil {
-		return nil, err
+	_, err := service.FunctionStore.Get(FunctionKey{fn.Space, fn.ID}.String(), &store.ReadOptions{Consistent: true})
+	if err != nil {
+		return nil, &function.ErrFunctionNotFound{ID: fn.ID}
 	}
 
 	byt, err := json.Marshal(fn)
diff --git a/libkv/function_test.go b/libkv/function_test.go
index 99df7dc..e8d2015 100644
--- a/libkv/function_test.go
+++ b/libkv/function_test.go
@@ -93,7 +93,7 @@ func TestUpdateFunction(t *testing.T) {
 		ID:       "testid",
 		Space:    "default",
 		Provider: &function.Provider{Type: function.HTTPEndpoint, URL: "http://example1.com"}}
-	_, err := service.UpdateFunction("default", fn)
+	_, err := service.UpdateFunction(fn)
 
 	assert.Nil(t, err)
 }
@@ -103,12 +103,10 @@ func TestUpdateFunction_ValidationError(t *testing.T) {
 	defer ctrl.Finish()
 
 	db := mock.NewMockStore(ctrl)
-	returned := []byte(`{"space":"default","functionId":"testid","provider":{"type":"http","url":"http://example.com"}}`)
-	db.EXPECT().Get("default/testid", gomock.Any()).Return(&store.KVPair{Value: returned}, nil)
 	service := &Service{FunctionStore: db, Log: zap.NewNop()}
 
 	fn := &function.Function{ID: "testid", Space: "default", Provider: &function.Provider{Type: function.HTTPEndpoint}}
-	_, err := service.UpdateFunction("default", fn)
+	_, err := service.UpdateFunction(fn)
 
 	assert.Equal(t, err, &function.ErrFunctionValidation{Message: "Missing required fields for HTTP endpoint."})
 }
@@ -125,7 +123,7 @@ func TestUpdateFunction_NotFoundError(t *testing.T) {
 		ID:       "testid",
 		Space:    "default",
 		Provider: &function.Provider{Type: function.HTTPEndpoint, URL: "http://example.com"}}
-	_, err := service.UpdateFunction("default", fn)
+	_, err := service.UpdateFunction(fn)
 
 	assert.Equal(t, err, &function.ErrFunctionNotFound{ID: "testid"})
 }
@@ -147,7 +145,7 @@ func TestUpdateFunction_PutError(t *testing.T) {
 		ID:       "testid",
 		Space:    "default",
 		Provider: &function.Provider{Type: function.HTTPEndpoint, URL: "http://example1.com"}}
-	_, err := service.UpdateFunction("default", fn)
+	_, err := service.UpdateFunction(fn)
 
 	assert.EqualError(t, err, "KV put error")
 }