diff --git a/src/steps/processLinter.ts b/src/steps/processLinter.ts
index a9e71cf4..313d500d 100644
--- a/src/steps/processLinter.ts
+++ b/src/steps/processLinter.ts
@@ -64,7 +64,8 @@ export async function processLinter(): Promise<void> {
 }
 
 export async function initLinterWorkers() {
-    const navigationPaths = TocService.getNavigationPaths();
+    const navigationPaths = TocService.getNavigationPaths()
+        .filter((filename) => extname(filename) === '.md');
     const chunkSize = getChunkSize(navigationPaths);
 
     if (process.env.DISABLE_PARALLEL_BUILD || chunkSize < MIN_CHUNK_SIZE || WORKERS_COUNT <= 0) {