diff --git a/ac3dec/configure.in b/ac3dec/configure.in
index ad26828..15172f5 100644
--- a/ac3dec/configure.in
+++ b/ac3dec/configure.in
@@ -15,6 +15,8 @@ AC_PROG_RANLIB
 
 AC_CHECK_LIB(ossaudio, _oss_ioctl, LIBS="$LIBS -lossaudio")
 
+AM_PATH_ALSA(0.9.0)
+
 dnl Set the appropriate architecture define
 case "$host" in
 i?86-*) AC_DEFINE(__i386__);;