diff --git a/src/core/annotation.js b/src/core/annotation.js
index cd2dd298e..becd119e6 100644
--- a/src/core/annotation.js
+++ b/src/core/annotation.js
@@ -492,11 +492,11 @@ class AnnotationBorderStyle {
    *
    * @public
    * @memberof AnnotationBorderStyle
-   * @param {Object} style - The style object
+   * @param {Name} style - The annotation style.
    * @see {@link shared/util.js}
    */
   setStyle(style) {
-    if (!style) {
+    if (!isName(style)) {
       return;
     }
     switch (style.name) {