diff --git a/types/axe-webdriverjs/axe-webdriverjs-tests.ts b/types/axe-webdriverjs/axe-webdriverjs-tests.ts
index 47eeadc8c5..d269b1ef28 100644
--- a/types/axe-webdriverjs/axe-webdriverjs-tests.ts
+++ b/types/axe-webdriverjs/axe-webdriverjs-tests.ts
@@ -20,7 +20,7 @@ const inTest = async (webDriver: WebDriver) => {
         .disableRules("rule")
         .disableRules(["rule", "rule"])
         .configure(spec)
-        .analyze((internalResults: AxeAnalysis) => {});
+        .analyze((err: Error, internalResults: AxeAnalysis) => {});
 
     const inapplicable: Result[] = analysis.inapplicable;
     const incomplete: Result[] = analysis.incomplete;
diff --git a/types/axe-webdriverjs/index.d.ts b/types/axe-webdriverjs/index.d.ts
index 3c8ae27249..f9d7ed2bbc 100644
--- a/types/axe-webdriverjs/index.d.ts
+++ b/types/axe-webdriverjs/index.d.ts
@@ -74,7 +74,9 @@ export interface AxeBuilder {
      * Perform analysis and retrieve results.
      * @param callback   Function to execute when analysis completes.
      */
-    analyze(callback: (results: AxeAnalysis) => void): Promise<AxeAnalysis>;
+    analyze(
+        callback?: (err: Error, results: AxeAnalysis) => void
+    ): Promise<AxeAnalysis>;
 }
 
 export const AxeBuilder: {