diff --git a/src/main/java/com/conveyal/r5/analyst/Grid.java b/src/main/java/com/conveyal/r5/analyst/Grid.java
index 4469c5a37..546e9490b 100644
--- a/src/main/java/com/conveyal/r5/analyst/Grid.java
+++ b/src/main/java/com/conveyal/r5/analyst/Grid.java
@@ -765,7 +765,7 @@ public static List<Grid> fromGeoJson (InputStream geoJsonInputStream, int zoom,
         SimpleFeatureCollection features = reader.getFeatures();
         Envelope envelope = features.getBounds();
 
-        checkWgsEnvelopeSize(envelope, "Shapefile");
+        checkWgsEnvelopeSize(envelope, "GeoJSON file");
         WebMercatorExtents extents = WebMercatorExtents.forWgsEnvelope(envelope, zoom);
 
         int total = features.size();