diff --git a/main.go b/main.go
index 461e7eb..a6612e5 100644
--- a/main.go
+++ b/main.go
@@ -150,7 +150,7 @@ func processFile(filePath, destDir, counterPath string, counter *int) {
 		*counter++
 		saveCounter(counterPath, *counter)
 
-		newName := fmt.Sprintf("%05d", *counter)
+		newName := fmt.Sprintf("%05d%s", *counter, filepath.Ext(filePath))
 		destPath := filepath.Join(destDir, newName)
 
 		_, err := os.Stat(destPath)