diff --git a/src/networking.c b/src/networking.c
index d62456a3fe60a315e317a59d8a7241e9d70ce78f..55b7475b4db0d70f9a65e319f642a3fc6e5f5751 100644
--- a/src/networking.c
+++ b/src/networking.c
@@ -253,9 +253,9 @@ void setDeferredMultiBulkLength(redisClient *c, void *node, long length) {
     if (ln->next != NULL) {
         next = listNodeValue(ln->next);
 
-        /* Only glue when the next node is an sds */
+        /* Only glue when the next node is non-NULL (an sds in this case) */
         if (next->ptr != NULL) {
-            len->ptr = sdscat(len->ptr,next->ptr);
+            len->ptr = sdscatlen(len->ptr,next->ptr,sdslen(next->ptr));
             listDelNode(c->reply,ln->next);
         }
     }