diff --git a/models/observations.go b/models/observations.go
index 8d70565..8596e04 100644
--- a/models/observations.go
+++ b/models/observations.go
@@ -167,7 +167,7 @@ type MockObservationsService struct {
 	Delete_ func(id int64) (bool, error)
 }
 
-var _ObservationsService = &MockObservationsService{}
+var _ ObservationsService = &MockObservationsService{}
 
 func (s *MockObservationsService) Get(id int64) (*Observation, error) {
 	if s.Get_ == nil {