diff --git a/papi/main.py b/papi/main.py
index 9c1360d..bd09c0b 100644
--- a/papi/main.py
+++ b/papi/main.py
@@ -66,7 +66,7 @@ def post_sonde(sonde: schemas.SondeBase, db: Session = Depends(get_db)):
     return list(sondes.values())
 
 
-@app.get("/sonde/")
+@app.get("/sonde/", response_model=List[schemas.SondeBase])
 def list_sonde():
     return [x for x in sondes.values()]