diff --git a/libisoburn/trunk/configure.ac b/libisoburn/trunk/configure.ac
index dc1d4a53..9958bfb2 100644
--- a/libisoburn/trunk/configure.ac
+++ b/libisoburn/trunk/configure.ac
@@ -322,7 +322,7 @@ dnl If PKG_CHECK_MODULES is to be used after this if-block,
 dnl then it might be necessary to perform PKG_PROG_PKG_CONFIG before the block.
 
   LIBBURN_REQUIRED=1.2.0
-  LIBISOFS_REQUIRED=1.2.0
+  LIBISOFS_REQUIRED=1.2.1
   PKG_CHECK_MODULES(LIBBURN, libburn-1 >= $LIBBURN_REQUIRED)
   PKG_CHECK_MODULES(LIBISOFS, libisofs-1 >= $LIBISOFS_REQUIRED)
   if test x$LIBCDIO_DEF = x; then