diff --git a/js_of_ocaml_patches.ml b/js_of_ocaml_patches.ml
index 58dd9d5..964b55e 100644
--- a/js_of_ocaml_patches.ml
+++ b/js_of_ocaml_patches.ml
@@ -15,6 +15,6 @@ module Dom_html = struct
     inherit Js_of_ocaml.Dom_html.canvasRenderingContext2D
 
     method ellipse :
-      float -> float -> float -> float -> float -> float -> float -> unit meth
+      float -> float -> float -> float -> float -> float -> float -> bool t -> unit meth
   end
 end
diff --git a/js_of_ocaml_patches.mli b/js_of_ocaml_patches.mli
index 4aecc41..8ed5d50 100644
--- a/js_of_ocaml_patches.mli
+++ b/js_of_ocaml_patches.mli
@@ -14,6 +14,6 @@ module Dom_html : sig
     inherit Js_of_ocaml.Dom_html.canvasRenderingContext2D
 
     method ellipse :
-      float -> float -> float -> float -> float -> float -> float -> unit meth
+      float -> float -> float -> float -> float -> float -> float -> bool t -> unit meth
   end
 end