diff --git a/lib/unicode_normalize.rb b/lib/unicode_normalize.rb
index 7719a372be..89c868560b 100644
--- a/lib/unicode_normalize.rb
+++ b/lib/unicode_normalize.rb
@@ -1,4 +1,4 @@
-# coding: utf-8
+# coding: utf-8
 
 # Copyright Ayumu Nojima (野島 歩) and Martin J. Dürst (duerst@it.aoyama.ac.jp)
 
diff --git a/lib/unicode_normalize/normalize.rb b/lib/unicode_normalize/normalize.rb
index b3c40d5da8..3075a56b50 100644
--- a/lib/unicode_normalize/normalize.rb
+++ b/lib/unicode_normalize/normalize.rb
@@ -1,4 +1,4 @@
-# coding: utf-8
+# coding: utf-8
 
 # Copyright Ayumu Nojima (野島 歩) and Martin J. Dürst (duerst@it.aoyama.ac.jp)