diff --git a/nixd/lib/Controller/Completion.cpp b/nixd/lib/Controller/Completion.cpp
index 4fcd4f5fe..f03bbaa1f 100644
--- a/nixd/lib/Controller/Completion.cpp
+++ b/nixd/lib/Controller/Completion.cpp
@@ -42,10 +42,10 @@ struct ExceedSizeError : std::exception {
 };
 
 void addItem(std::vector<CompletionItem> &Items, CompletionItem Item) {
+  Items.emplace_back(std::move(Item));
   if (Items.size() >= MaxCompletionSize) {
     throw ExceedSizeError();
   }
-  Items.emplace_back(std::move(Item));
 }
 
 bool hasConcreteChild(const Node &N) {
diff --git a/nixd/tools/nixd/test/completion/options-incomplete.md b/nixd/tools/nixd/test/completion/options-incomplete.md
index 2381ad118..490b82e3d 100644
--- a/nixd/tools/nixd/test/completion/options-incomplete.md
+++ b/nixd/tools/nixd/test/completion/options-incomplete.md
@@ -62,7 +62,7 @@
      CHECK: "id": 1,
 CHECK-NEXT:  "jsonrpc": "2.0",
 CHECK-NEXT:  "result": {
-CHECK-NEXT:    "isIncomplete": false,
+CHECK-NEXT:    "isIncomplete": true,
 ```