diff --git a/tutorial/cpp/4-GPU.cpp b/tutorial/cpp/4-GPU.cpp
index ec34c54cd..f661ac015 100644
--- a/tutorial/cpp/4-GPU.cpp
+++ b/tutorial/cpp/4-GPU.cpp
@@ -79,7 +79,7 @@ int main() {
     // Using an IVF index
 
     int nlist = 100;
-    faiss::gpu::GpuIndexIVFFlat index_ivf(&res, d, nlist);
+    faiss::gpu::GpuIndexIVFFlat index_ivf(&res, d, nlist, faiss::METRIC_L2);
 
     assert(!index_ivf.is_trained);
     index_ivf.train(nb, xb);
diff --git a/tutorial/cpp/5-Multiple-GPUs.cpp b/tutorial/cpp/5-Multiple-GPUs.cpp
index 852f59191..ca926898a 100644
--- a/tutorial/cpp/5-Multiple-GPUs.cpp
+++ b/tutorial/cpp/5-Multiple-GPUs.cpp
@@ -44,7 +44,7 @@ int main() {
 
     printf("Number of GPUs: %d\n", ngpus);
 
-    std::vector<faiss::gpu::GpuResources*> res;
+    std::vector<faiss::gpu::GpuResourcesProvider*> res;
     std::vector<int> devs;
     for(int i = 0; i < ngpus; i++) {
         res.push_back(new faiss::gpu::StandardGpuResources);