diff --git a/sapfor/experts/Sapfor_2017/_src/Transformations/set_implicit_none.cpp b/sapfor/experts/Sapfor_2017/_src/Transformations/set_implicit_none.cpp
index 6c4de80..432c74c 100644
--- a/sapfor/experts/Sapfor_2017/_src/Transformations/set_implicit_none.cpp
+++ b/sapfor/experts/Sapfor_2017/_src/Transformations/set_implicit_none.cpp
@@ -14,9 +14,9 @@ using std::make_pair;
 using std::string;
 using std::to_string;
 
-map<char, SgType*> implicit;
-set<SgSymbol*> vars;
-vector<SgSymbol*> toDecl;
+static map<char, SgType*> implicit;
+static set<SgSymbol*> vars;
+static vector<SgSymbol*> toDecl;
 
 static void InsertToMap(SgType* type, SgExpression* letters) {