diff --git a/configure.ac b/configure.ac
index 3acab5b3acfd..dd584496716e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1644,6 +1644,7 @@
             AC_DEFINE_UNQUOTED([HAVE_HTP_CONFIG_SET_LZMA_LAYERS],[1],[Assuming htp_config_set_lzma_layers function in bundled libhtp])
             AC_DEFINE_UNQUOTED([HAVE_HTP_CONFIG_SET_COMPRESSION_BOMB_LIMIT],[1],[Assuming htp_config_set_compression_bomb_limit function in bundled libhtp])
             AC_DEFINE_UNQUOTED([HAVE_HTP_CONFIG_SET_COMPRESSION_TIME_LIMIT],[1],[Assuming htp_config_set_compression_time_limit function in bundled libhtp])
+            AC_DEFINE_UNQUOTED([HAVE_HTP_CONFIG_SET_MAX_TX],[1],[Assuming htp_config_set_max_tx function in bundled libhtp])
         else
             echo
             echo "  ERROR: Libhtp is not bundled. Get libhtp by doing:"