diff --git a/modules/gpu/src/mssegmentation.cpp b/modules/gpu/src/mssegmentation.cpp
index ec0cefa1e..609fdda7c 100644
--- a/modules/gpu/src/mssegmentation.cpp
+++ b/modules/gpu/src/mssegmentation.cpp
@@ -102,8 +102,8 @@ public:
     int nume_max;
     int nume;
 private:
-    Graph(const Graph&) {}
-    Graph operator =(const Graph&) {}
+    Graph(const Graph&);
+    void operator =(const Graph&);
 };