diff --git a/api/app/schemas/elevation.py b/api/app/schemas/elevation.py
index 5bac01c..c3cac4c 100644
--- a/api/app/schemas/elevation.py
+++ b/api/app/schemas/elevation.py
@@ -206,6 +206,7 @@ class ElevationTerrainLayerResponse(BaseModel):
     scheme: Literal["tms"] = "tms"
     projection: Literal["EPSG:4326"] = "EPSG:4326"
     tiles: list[str]
+    minzoom: int
     maxzoom: int
     extensions: list[str] = Field(default_factory=list)
     attribution: str | None = None
diff --git a/api/app/services/elevation_service.py b/api/app/services/elevation_service.py
index 915d105..bf9c43d 100644
--- a/api/app/services/elevation_service.py
+++ b/api/app/services/elevation_service.py
@@ -3083,6 +3083,7 @@ def _build_dataset_terrain_tiles(db: Session, dataset: ElevationDataset) -> _Ter
 
         layer_payload = ElevationTerrainLayerResponse(
             tiles=[f"{{z}}/{{x}}/{{y}}.terrain?v={TERRAIN_TILE_VERSION}"],
+            minzoom=0,
             maxzoom=max_zoom,
             attribution=f"{dataset.code} {dataset.name}",
             bounds=[bounds["west"], bounds["south"], bounds["east"], bounds["north"]],