diff --git a/js-packages/@fortawesome/fontawesome-svg-core/index.d.ts b/js-packages/@fortawesome/fontawesome-svg-core/index.d.ts
index fba0b7ef7..1c97abf5b 100644
--- a/js-packages/@fortawesome/fontawesome-svg-core/index.d.ts
+++ b/js-packages/@fortawesome/fontawesome-svg-core/index.d.ts
@@ -116,7 +116,7 @@ export interface DOM {
   i2svg(params?: { node: Node; callback?: () => void }): Promise<void>;
   css(): string;
   insertCss(): string;
-  watch(params?: { autoReplaceSvgRoot: Node, observeMutationsRoot: Node}): void;
+  watch(params?: { autoReplaceSvgRoot?: Node, observeMutationsRoot?: Node}): void;
 }
 type IconDefinitionOrPack = IconDefinition | IconPack;
 export interface Library {