diff --git a/config.h.in b/config.h.in
index bd44ead2..a91f4614 100644
--- a/config.h.in
+++ b/config.h.in
@@ -6,6 +6,9 @@
 /* Define to 1 if you have the <arpa/inet.h> header file. */
 #undef HAVE_ARPA_INET_H
 
+/* Define to 1 if you have the <assert.h> header file. */
+#undef HAVE_ASSERT_H
+
 /* Define to 1 if you have the `getaddrinfo' function. */
 #undef HAVE_GETADDRINFO
 
diff --git a/configure.in b/configure.in
index 8c2eea6d..de7d329f 100644
--- a/configure.in
+++ b/configure.in
@@ -36,7 +36,7 @@ AC_SEARCH_LIBS([gethostbyname], [nsl])
 AC_SEARCH_LIBS([socket], [socket])
 
 # Checks for header files.
-AC_CHECK_HEADERS([arpa/inet.h limits.h netdb.h netinet/in.h stdlib.h string.h strings.h sys/socket.h unistd.h])
+AC_CHECK_HEADERS([assert.h arpa/inet.h limits.h netdb.h netinet/in.h stdlib.h string.h strings.h sys/socket.h unistd.h])
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_TYPE_SIZE_T