diff --git a/src/common.ts b/src/common.ts
index f5e6ffa7..df6c6914 100644
--- a/src/common.ts
+++ b/src/common.ts
@@ -562,6 +562,10 @@ export function checkCopyrightYears(path: PathLike, subDir: PathLike): void {
     const fileStats = lstatSync(fileSystemObjectPath);
 
     if (fileStats.isFile()) {
+      if (fileSystemObject.match(/\.ts$/) === null) {
+        continue;
+      }
+
       const content = readFileSync(fileSystemObjectPath)
         .toString()
         .split('\n');