diff --git a/src/map.c b/src/map.c
index 064c52e..fced0ed 100644
--- a/src/map.c
+++ b/src/map.c
@@ -258,6 +258,7 @@
 	desc->pat.delete = pat_delete_fcts[conv->private];
 	desc->pat.prune = pat_prune_fcts[conv->private];
 	desc->pat.find_smp = pat_find_smp_fcts[conv->private];
+	desc->pat.expect_type = pat_match_types[conv->private];
 
 	/* Set the output parse method. */
 	switch (desc->conv->out_type) {