diff --git a/src/libs/3rdparty/syntax-highlighting/src/lib/state.h b/src/libs/3rdparty/syntax-highlighting/src/lib/state.h
index 42af55b1a14..8213c85a931 100644
--- a/src/libs/3rdparty/syntax-highlighting/src/lib/state.h
+++ b/src/libs/3rdparty/syntax-highlighting/src/lib/state.h
@@ -62,7 +62,7 @@ public:
 
 private:
     friend class StateData;
-    friend std::size_t qHash(const State &, std::size_t);
+    friend KSYNTAXHIGHLIGHTING_EXPORT std::size_t qHash(const State &, std::size_t);
     QExplicitlySharedDataPointer<StateData> d;
 };
 }