diff --git a/include/dtt.h b/include/dtt.h
index 29268f6..058bca4 100644
--- a/include/dtt.h
+++ b/include/dtt.h
@@ -2,7 +2,7 @@
  * (C) Copyright 2001
  * Erik Theisen,  Wave 7 Optics, etheisen@mindspring.com.
  *
- * SPDX-License-Identifier:	GPL-2.0+ 
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 /*