diff --git a/utsushi/configure.ac b/utsushi/configure.ac
index 8997eb9..fef09de 100644
--- a/utsushi/configure.ac
+++ b/utsushi/configure.ac
@@ -352,7 +352,7 @@ AS_IF([test xno != "x$with_usb"],
 AM_CONDITIONAL([have_libusb], [test x != "x$LIBUSB_LIBS"])
 
 AS_IF([test xno != "x$with_magick_pp"],
-   AS_CASE("x$with_magick_pp",
+   [AS_CASE("x$with_magick_pp",
      [xGraphicsMagick],
        [PKG_CHECK_MODULES([LIBMAGICK_PP], [GraphicsMagick++],
           [AC_DEFINE([HAVE_GRAPHICS_MAGICK_PP], [1])])
@@ -373,11 +373,11 @@ AS_IF([test xno != "x$with_magick_pp"],
        ],
      [dnl default case
       AC_MSG_ERROR([unknown value: --with-magick-pp=$with_magick_pp])
-     ]))
+     ])])
 AM_CONDITIONAL([have_libmagick_pp], [test x != "x$LIBMAGICK_PP_LIBS"])
 
 AS_IF([test xno != "x$with_magick"],
-   AS_CASE("x$with_magick",
+   [AS_CASE("x$with_magick",
      [xGraphicsMagick],
        [AC_CHECK_PROGS([MAGICK_CONVERT], [gm])
         AS_IF([test xgm != x$MAGICK_CONVERT],
@@ -408,7 +408,7 @@ AS_IF([test xno != "x$with_magick"],
        ],
      [dnl default case
       AC_MSG_ERROR([unknown value: --with-magick=$with_magick])
-     ]))
+     ])])
 AC_DEFINE_UNQUOTED([MAGICK_CONVERT], ["$MAGICK_CONVERT"])
 AM_CONDITIONAL([have_magick], [test x != "x$MAGICK_CONVERT"])