diff --git a/src/box/alter.cc b/src/box/alter.cc
index bb78af6a5c9d9694b87d89ce7937abaaa65489b0..5fc251873894c24b7d82e5a45d62f3c37840d07d 100644
--- a/src/box/alter.cc
+++ b/src/box/alter.cc
@@ -540,7 +540,7 @@ space_format_decode(const char *data, uint32_t *out_count,
 	struct field_def *region_defs =
 		(struct field_def *) region_alloc(region, size);
 	if (region_defs == NULL) {
-		diag_set(OutOfMemory, size, "region", "new slab");
+		diag_set(OutOfMemory, size, "region", "struct field_def");
 		return -1;
 	}
 	/*
@@ -810,7 +810,7 @@ txn_alter_trigger_new(trigger_f run, void *data)
 		region_aligned_alloc(&in_txn()->region, size,
 				     alignof(struct trigger));
 	if (trigger == NULL) {
-		diag_set(OutOfMemory, size, "region", "new slab");
+		diag_set(OutOfMemory, size, "region", "struct trigger");
 		return NULL;
 	}
 	trigger = (struct trigger *)memset(trigger, 0, size);
@@ -861,7 +861,7 @@ alter_space_new(struct space *old_space)
 		region_aligned_alloc(&in_txn()->region, size,
 				     alignof(struct alter_space));
 	if (alter == NULL) {
-		diag_set(OutOfMemory, size, "region", "new slab");
+		diag_set(OutOfMemory, size, "region", "struct alter_space");
 		return NULL;
 	}
 	alter = (struct alter_space *)memset(alter, 0, size);
@@ -4824,7 +4824,7 @@ decode_fk_links(struct tuple *tuple, uint32_t *out_count,
 	struct field_link *region_links =
 		(struct field_link *)region_alloc(&fiber()->gc, size);
 	if (region_links == NULL) {
-		diag_set(OutOfMemory, size, "region", "new slab");
+		diag_set(OutOfMemory, size, "region", "struct field_link");
 		return NULL;
 	}
 	memset(region_links, 0, size);
diff --git a/src/box/user.cc b/src/box/user.cc
index 39520f23172074ae3b2ed8c6796fb7f5a6f86ed7..a012cb1969fc13e67da02ff8b0c2f4746e1df466 100644
--- a/src/box/user.cc
+++ b/src/box/user.cc
@@ -196,7 +196,7 @@ user_grant_priv(struct user *user, struct priv_def *def)
 		old = (struct priv_def *)
 			region_alloc(&user->pool, size);
 		if (old == NULL) {
-			diag_set(OutOfMemory, size, "region", "new slab");
+			diag_set(OutOfMemory, size, "region", "struct priv_def");
 			return -1;
 		}
 		*old = *def;