diff --git a/src/buffer.c b/src/buffer.c
index 8bb64a67b46..97a53c5852d 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -5357,7 +5357,7 @@ This is the same as (default-value 'left-margin).  */);
 
   DEFVAR_LISP_NOPRO ("default-tab-width",
 		     &buffer_defaults.tab_width,
-    doc: /* Default value of `tab-width' for buffers that do not override it.
+		     doc: /* Default value of `tab-width' for buffers that do not override it.
 This is the same as (default-value 'tab-width).  */);
 
   DEFVAR_LISP_NOPRO ("default-case-fold-search",