diff --git a/model/types.go b/model/types.go
index ba17feb..8de5505 100644
--- a/model/types.go
+++ b/model/types.go
@@ -31,7 +31,7 @@ type Reading struct {
 	Time    time.Time `json:"time"`
 	Glucose float64   `json:"glucose"`
 	Ketone  float64   `json:"ketone"`
-	GKI     float64   `json:"GKI"`
+	GKI     float64   `json:"gki"`
 }
 
 // NewReading creates a new Reading instance capturing the current time, glucose level,