diff --git a/configure.ac b/configure.ac
index b20f5b7f08..46dfa81d47 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5839,6 +5839,9 @@ then
         ENABLED_ALPN="yes"
         AM_CFLAGS="$AM_CFLAGS -DHAVE_ALPN"
     fi
+
+    # cert gen requires alt names
+    ENABLED_ALTNAMES="yes"
 fi
 
 if test "$ENABLED_LIGHTY" = "yes"