diff --git a/desmume/configure.ac b/desmume/configure.ac
index 35d8d148b..05e21e3b1 100644
--- a/desmume/configure.ac
+++ b/desmume/configure.ac
@@ -96,7 +96,6 @@ HAVE_OPENAL=no
 dnl - openal support
 AC_ARG_ENABLE(openal,
 	      [AC_HELP_STRING(--enable-openal, enable experimental OpenAL microphone input)],
-	      [openal=$enableval],
 	      [openal=yes])
 
 if test "x$openal" = "xyes" ; then