diff --git a/src/display/api.js b/src/display/api.js
index 3abf43907..e206eed9b 100644
--- a/src/display/api.js
+++ b/src/display/api.js
@@ -2762,19 +2762,15 @@ class WorkerTransport {
             break;
           }
 
-          let fontRegistry = null;
-          if (params.pdfBug && globalThis.FontInspector?.enabled) {
-            fontRegistry = {
-              registerFont(font, url) {
-                globalThis.FontInspector.fontAdded(font, url);
-              },
-            };
-          }
+          const inspectFont =
+            params.pdfBug && globalThis.FontInspector?.enabled
+              ? (font, url) => globalThis.FontInspector.fontAdded(font, url)
+              : null;
           const font = new FontFaceObject(exportedData, {
             isEvalSupported: params.isEvalSupported,
             disableFontFace: params.disableFontFace,
             ignoreErrors: params.ignoreErrors,
-            fontRegistry,
+            inspectFont,
           });
 
           this.fontLoader
diff --git a/src/display/font_loader.js b/src/display/font_loader.js
index b095fc8b2..cc29e7c45 100644
--- a/src/display/font_loader.js
+++ b/src/display/font_loader.js
@@ -322,7 +322,7 @@ class FontFaceObject {
       isEvalSupported = true,
       disableFontFace = false,
       ignoreErrors = false,
-      fontRegistry = null,
+      inspectFont = null,
     }
   ) {
     this.compiledGlyphs = Object.create(null);
@@ -333,7 +333,7 @@ class FontFaceObject {
     this.isEvalSupported = isEvalSupported !== false;
     this.disableFontFace = disableFontFace === true;
     this.ignoreErrors = ignoreErrors === true;
-    this.fontRegistry = fontRegistry;
+    this._inspectFont = inspectFont;
   }
 
   createNativeFontFace() {
@@ -357,7 +357,7 @@ class FontFaceObject {
       );
     }
 
-    this.fontRegistry?.registerFont(this);
+    this._inspectFont?.(this);
     return nativeFontFace;
   }
 
@@ -379,7 +379,7 @@ class FontFaceObject {
       rule = `@font-face {font-family:"${this.cssFontInfo.fontFamily}";${css}src:${url}}`;
     }
 
-    this.fontRegistry?.registerFont(this, url);
+    this._inspectFont?.(this, url);
     return rule;
   }