diff --git a/types/leaflet/index.d.ts b/types/leaflet/index.d.ts
index 217f2f5f60..7cb5fd143f 100644
--- a/types/leaflet/index.d.ts
+++ b/types/leaflet/index.d.ts
@@ -1290,7 +1290,7 @@ export class GeoJSON<P = any> extends FeatureGroup<P> {
      * Resets the given vector layer's style to the original GeoJSON style,
      * useful for resetting style after hover events.
      */
-    resetStyle(layer: Layer): Layer;
+    resetStyle(layer?: Layer): Layer;
 
     /**
      * Same as FeatureGroup's setStyle method, but style-functions are also
diff --git a/types/leaflet/leaflet-tests.ts b/types/leaflet/leaflet-tests.ts
index f97716fa17..a8a3d1a476 100644
--- a/types/leaflet/leaflet-tests.ts
+++ b/types/leaflet/leaflet-tests.ts
@@ -509,6 +509,9 @@ const styler: L.StyleFunction<MyProperties> = () => style;
 geojson.setStyle(style);
 geojson.setStyle(styler);
 
+geojson.resetStyle();
+geojson.resetStyle(layer);
+
 class MyMarker extends L.Marker {
     constructor() {
         super([12, 13]);