diff --git a/tree/treeplayer/test/data.h b/tree/treeplayer/test/data.h
index f6dafdd8a3f97..cb22066e6d264 100644
--- a/tree/treeplayer/test/data.h
+++ b/tree/treeplayer/test/data.h
@@ -3,13 +3,26 @@
 
 #include <vector>
 struct Data {
-   unsigned int fUSize;
-   int fSize;
-   double* fArray; //[fSize]
-   float* fUArray; //[fUSize]
-   std::vector<double> fVec;
-   Double32_t fDouble32;
-   Float16_t fFloat16;
+   unsigned int fUSize{2};
+   int fSize{4};
+   double *fArray; //[fSize]
+   float *fUArray; //[fUSize]
+   std::vector<double> fVec{17., 18., 19., 20., 21., 22.};
+   Double32_t fDouble32{17.};
+   Float16_t fFloat16{44.};
+
+   Data() : fArray(new double[4]{12., 13., 14., 15.}), fUArray(new float[2]{42., 43.}) {}
+   Data(const Data &) = delete;
+   Data &operator=(const Data &) = delete;
+   Data(Data &&) = delete;
+   Data &operator=(Data &&) = delete;
+   ~Data()
+   {
+      delete[] fArray;
+      fArray = nullptr;
+      delete[] fUArray;
+      fUArray = nullptr;
+   }
 };
 
 struct V {
diff --git a/tree/treeplayer/test/leafs.cxx b/tree/treeplayer/test/leafs.cxx
index 69ed3fc3d4447..413054932e8d4 100644
--- a/tree/treeplayer/test/leafs.cxx
+++ b/tree/treeplayer/test/leafs.cxx
@@ -95,13 +95,6 @@ std::unique_ptr<TTree> CreateTree() {
    Data data;
    auto tree = std::make_unique<TTree>("T", "test tree");
    tree->Branch("Data", &data);
-   data.fArray = new double[4]{12., 13., 14., 15.};
-   data.fSize = 4;
-   data.fUArray = new float[2]{42., 43.};
-   data.fUSize = 2;
-   data.fVec = { 17., 18., 19., 20., 21., 22.};
-   data.fDouble32 = 17.;
-   data.fFloat16 = 44.;
    tree->Fill();
 
    data.fVec.clear();