diff --git a/gen-C++ b/gen-C++
index 415cab1..924cd47 100755
--- a/gen-C++
+++ b/gen-C++
@@ -1,4 +1,5 @@
 c++ -o test_memory_C++ \
+  -std=c++11 \
   -Ilanguage-C++/Memory/src \
   language-C++/Memory/src/Memory.Aux.cpp \
   language-C++/Memory/src/Memory.Test.cpp \
diff --git a/language-C++/Memory/src/Memory.Aux.cpp b/language-C++/Memory/src/Memory.Aux.cpp
index be596b3..af6888e 100644
--- a/language-C++/Memory/src/Memory.Aux.cpp
+++ b/language-C++/Memory/src/Memory.Aux.cpp
@@ -5,7 +5,7 @@ std::map<int, int> memory_generateConstPlayfield(
   int n
 ) {
   std::map<int, int> idGroups;
-  int id = 0;
+  auto id = 0;
   for (int gid = 0; gid < n; ++gid) {
     idGroups[id] = gid;
     id += 1;