diff --git a/src/libs/qmljs/persistenttrie.h b/src/libs/qmljs/persistenttrie.h
index 94a68d0a3ce..bca8bb14617 100644
--- a/src/libs/qmljs/persistenttrie.h
+++ b/src/libs/qmljs/persistenttrie.h
@@ -96,8 +96,8 @@ public:
     void intersect(const Trie &v);
     void merge(const Trie &v);
 
-    friend QDebug &operator<<(QDebug &dbg, const TrieNode::Ptr &trie);
-    friend QDebug &operator<<(QDebug &dbg, const Trie &trie);
+    friend QMLJS_EXPORT QDebug &operator<<(QDebug &dbg, const TrieNode::Ptr &trie);
+    friend QMLJS_EXPORT QDebug &operator<<(QDebug &dbg, const Trie &trie);
 
     TrieNode::Ptr trie;
 };