diff --git a/cmd/adpcm/decode-pcm/decode-pcm.go b/cmd/adpcm/decode-pcm/decode-pcm.go
index 5d50dfe1..e19993f5 100644
--- a/cmd/adpcm/decode-pcm/decode-pcm.go
+++ b/cmd/adpcm/decode-pcm/decode-pcm.go
@@ -22,7 +22,7 @@ LICENSE
   for more details.
 
   You should have received a copy of the GNU General Public License in gpl.txt.
-	If not, see [GNU licenses](http://www.gnu.org/licenses).
+  If not, see [GNU licenses](http://www.gnu.org/licenses).
 */
 
 package main
diff --git a/cmd/adpcm/encode-pcm/encode-pcm.go b/cmd/adpcm/encode-pcm/encode-pcm.go
index ae19a505..7e6bcfa6 100644
--- a/cmd/adpcm/encode-pcm/encode-pcm.go
+++ b/cmd/adpcm/encode-pcm/encode-pcm.go
@@ -21,8 +21,8 @@ LICENSE
   FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
   for more details.
 
-	You should have received a copy of the GNU General Public License in gpl.txt.
-	If not, see [GNU licenses](http://www.gnu.org/licenses).
+  You should have received a copy of the GNU General Public License in gpl.txt.
+  If not, see [GNU licenses](http://www.gnu.org/licenses).
 */
 
 package main