diff --git a/src/sound/oalsound.cpp b/src/sound/oalsound.cpp
index aa35b03b5a..601ec72002 100644
--- a/src/sound/oalsound.cpp
+++ b/src/sound/oalsound.cpp
@@ -11,12 +11,12 @@
 ** are met:
 **
 ** 1. Redistributions of source code must retain the above copyright
-**	  notice, this list of conditions and the following disclaimer.
+**    notice, this list of conditions and the following disclaimer.
 ** 2. Redistributions in binary form must reproduce the above copyright
-**	  notice, this list of conditions and the following disclaimer in the
-**	  documentation and/or other materials provided with the distribution.
+**    notice, this list of conditions and the following disclaimer in the
+**    documentation and/or other materials provided with the distribution.
 ** 3. The name of the author may not be used to endorse or promote products
-**	  derived from this software without specific prior written permission.
+**    derived from this software without specific prior written permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 ** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES