diff --git a/mdmon.c b/mdmon.c
index 323ee62..b980083 100644
--- a/mdmon.c
+++ b/mdmon.c
@@ -92,6 +92,8 @@ static struct superswitch *find_metadata_methods(char *vers)
 {
 	if (strcmp(vers, "ddf") == 0)
 		return &super_ddf;
+	if (strcmp(vers, "imsm") == 0)
+		return &super_imsm;
 	return NULL;
 }