diff --git a/m4/aria2_arg.m4 b/m4/aria2_arg.m4
index 93807ce6..94c08175 100644
--- a/m4/aria2_arg.m4
+++ b/m4/aria2_arg.m4
@@ -6,12 +6,12 @@ AC_DEFUN([ARIA2_ARG_WITH],
 	AS_HELP_STRING([--with-$1], [Use $1.]),
 	[with_$1_requested=$withval with_$1=$withval], [with_$1=no])]
 )
-dnl ARIA2_ARG_WITHOUT(PACKAGE)
+dnl ARIA2_ARG_WITH(PACKAGE)
 dnl wrapper for AC_ARG_WITH with default value 'yes'.
 dnl If --with-$1 is given explicitly, set with_$1_requested to given value.
 AC_DEFUN([ARIA2_ARG_WITHOUT],
 [AC_ARG_WITH([$1],
-	AS_HELP_STRING([--without-$1], [Do not use $1. [default=yes]]),
+	AS_HELP_STRING([--without-$1], [Do not use $1. [default=check]]),
 	[with_$1_requested=$withval with_$1=$withval], [with_$1=yes])]
 )
 
@@ -28,7 +28,7 @@ dnl wrapper for AC_ARG_ENABLE with default value 'yes'.
 dnl If --enable-$1 is given explicitly, set enable_$1_requested to given value.
 AC_DEFUN([ARIA2_ARG_DISABLE],
 [AC_ARG_ENABLE([$1],
-  AS_HELP_STRING([--disable-$1], [Disable $1 support. [default=yes]]),
+  AS_HELP_STRING([--disable-$1], [Disable $1 support. [default=check]]),
 	[enable_$1_requested=$enableval enable_$1=$enableval], [enable_$1=yes])]
 )