diff --git a/demos/tunala/configure.in b/demos/tunala/configure.in
index b2a6ffc756..590cdbfd26 100644
--- a/demos/tunala/configure.in
+++ b/demos/tunala/configure.in
@@ -10,6 +10,7 @@ dnl AM_PROG_LIBTOOL
 
 dnl Checks for libraries.
 AC_CHECK_LIB(dl, dlopen)
+AC_CHECK_LIB(z, inflate)
 AC_CHECK_LIB(socket, socket)
 AC_CHECK_LIB(nsl, gethostbyname)