diff --git a/src/box/func_cache.c b/src/box/func_cache.c
index 6657bfe9fdecf95963f0b6acf0320b81a58a4911..1a465642d10e58e81196fec0968df9a025efd0f8 100644
--- a/src/box/func_cache.c
+++ b/src/box/func_cache.c
@@ -14,7 +14,8 @@ static struct mh_i32ptr_t *funcs;
 static struct mh_strnptr_t *funcs_by_name;
 
 const char *func_cache_holder_type_strs[FUNC_HOLDER_MAX] = {
-	"constraint",
+	[FUNC_HOLDER_CONSTRAINT] = "constraint",
+	[FUNC_HOLDER_SPACE_UPGRADE] = "space upgrade",
 };
 
 void
diff --git a/src/box/func_cache.h b/src/box/func_cache.h
index b022c10e54c2b5135f407c6753c4ba06ccf69614..b95138165e38d840b57da3c9901470426716c73c 100644
--- a/src/box/func_cache.h
+++ b/src/box/func_cache.h
@@ -19,6 +19,7 @@ struct func;
  */
 enum func_holder_type {
 	FUNC_HOLDER_CONSTRAINT,
+	FUNC_HOLDER_SPACE_UPGRADE,
 	FUNC_HOLDER_MAX,
 };