diff --git a/src/helpers/DiffHelpers.ts b/src/helpers/DiffHelpers.ts
index 48040d9..d30108c 100644
--- a/src/helpers/DiffHelpers.ts
+++ b/src/helpers/DiffHelpers.ts
@@ -102,7 +102,7 @@ export function formatDiffOutput(
 
 export function getDocumentMajorVersion(document: any): string {
   const asyncapiVersion: string = document.asyncapi;
-  return asyncapiVersion.split('.')[0] as string;
+  return asyncapiVersion.split('.')[0];
 }
 
 export function incompatibleDocuments(
diff --git a/src/main.ts b/src/main.ts
index 35ac67b..7b00cad 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -50,7 +50,7 @@ export function diff(
   const diffOutput = generateDiff(firstDocument, secondDocument);
   const output = categorizeChanges(standard as OverrideStandard, diffOutput);
   return new AsyncAPIDiff(JSON.stringify(output), {
-    outputType: config.outputType || 'json',
-    markdownSubtype: config.markdownSubtype || 'json',
+    outputType: config.outputType ?? 'json',
+    markdownSubtype: config.markdownSubtype ?? 'json',
   });
 }