diff --git a/src/networking.c b/src/networking.c
index 6751f5c7b8..96dd05d505 100644
--- a/src/networking.c
+++ b/src/networking.c
@@ -888,8 +888,11 @@ void setDeferredAggregateLen(client *c, void *node, long length, char prefix) {
     }
 
     char lenstr[128];
-    size_t lenstr_len = snprintf(lenstr, sizeof(lenstr), "%c%ld\r\n", prefix, length);
-    setDeferredReply(c, node, lenstr, lenstr_len);
+    lenstr[0] = prefix;
+    size_t lenstr_len = ll2string(lenstr + 1, sizeof(lenstr) - 1, length);
+    lenstr[lenstr_len + 1] = '\r';
+    lenstr[lenstr_len + 2] = '\n';
+    setDeferredReply(c, node, lenstr, lenstr_len + 3);
 }
 
 void setDeferredArrayLen(client *c, void *node, long length) {