diff --git a/platform/qt/include/qmapboxgl.hpp b/platform/qt/include/qmapboxgl.hpp
index ce9cf1778..ebbd94992 100644
--- a/platform/qt/include/qmapboxgl.hpp
+++ b/platform/qt/include/qmapboxgl.hpp
@@ -62,7 +62,7 @@ public:
     void setApiBaseUrl(const QString &);
 
     std::function<std::string(const std::string &&)> resourceTransform() const;
-    void setResourceTransform(std::function<std::string(const std::string &&)> &);
+    void setResourceTransform(const std::function<std::string(const std::string &&)> &);
 
 private:
     GLContextMode m_contextMode;
diff --git a/platform/qt/src/qmapboxgl.cpp b/platform/qt/src/qmapboxgl.cpp
index 105e1d851..074ef280a 100644
--- a/platform/qt/src/qmapboxgl.cpp
+++ b/platform/qt/src/qmapboxgl.cpp
@@ -378,7 +378,7 @@ std::function<std::string(const std::string &&)> QMapboxGLSettings::resourceTran
     used add or remove custom parameters, or reroute certain requests to other
     servers or endpoints.
 */
-void QMapboxGLSettings::setResourceTransform(std::function<std::string(const std::string &&)> &transform)
+void QMapboxGLSettings::setResourceTransform(const std::function<std::string(const std::string &&)> &transform)
 {
     m_resourceTransform = transform;
 }