diff --git a/ChangeLog.txt b/ChangeLog.txt
index 623099b4..1b8e2355 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -1,6 +1,8 @@
 Broker:
 - Various fixes for `allow_zero_length_clientid` config, where this option was
   not being set correctly. Closes #1429.
+- Fix incorrect memory tracking causing problems with memory_limit option.
+  Closes #1437.
 
 Client library:
 - Fix publish properties not being passed to on_message_v5 callback for QoS 2
diff --git a/src/subs.c b/src/subs.c
index c059874f..266669e8 100644
--- a/src/subs.c
+++ b/src/subs.c
@@ -684,7 +684,7 @@ struct mosquitto__subhier *sub__add_hier_entry(struct mosquitto__subhier *parent
 	}
 	child->parent = parent;
 	child->topic_len = len;
-	child->topic = malloc(len+1);
+	child->topic = mosquitto__malloc(len+1);
 	if(!child->topic){
 		child->topic_len = 0;
 		mosquitto__free(child);