diff --git a/src/thorin/transform/hoist_enters.cpp b/src/thorin/transform/hoist_enters.cpp
index 5cd7fcfb4..7e8ab216e 100644
--- a/src/thorin/transform/hoist_enters.cpp
+++ b/src/thorin/transform/hoist_enters.cpp
@@ -8,7 +8,7 @@
 
 namespace thorin {
 
-std::stack<const Def*> todo;
+static std::stack<const Def*> hoist_enters_todo;
 
 static void find_enters(std::deque<const Enter*>& enters, const Def* def) {
     if (auto enter = def->isa<Enter>())
@@ -19,15 +19,15 @@ static void find_enters(std::deque<const Enter*>& enters, const Def* def) {
 
     for (auto use : def->uses()) {
         if (auto memop = use->isa<MemOp>())
-            todo.push(memop);
+            hoist_enters_todo.push(memop);
     }
 }
 
 static void find_enters(std::deque<const Enter*>& enters, Continuation* continuation) {
     if (auto mem_param = continuation->mem_param()) {
-        todo.push(mem_param);
-        while (!todo.empty()) {
-            auto next_item = pop(todo);
+        hoist_enters_todo.push(mem_param);
+        while (!hoist_enters_todo.empty()) {
+            auto next_item = pop(hoist_enters_todo);
 
             find_enters(enters, next_item);
         }
diff --git a/src/thorin/transform/importer.cpp b/src/thorin/transform/importer.cpp
index d476fb718..976e1c77f 100644
--- a/src/thorin/transform/importer.cpp
+++ b/src/thorin/transform/importer.cpp
@@ -1,9 +1,5 @@
 #include "thorin/transform/importer.h"
 
-#include <set>
-#include <stack>
-#include <utility>
-
 namespace thorin {
 
 const Type* Importer::import_type(const Type* otype) {
@@ -32,10 +28,7 @@ const Type* Importer::import_type(const Type* otype) {
     return ntype;
 }
 
-std::stack<std::pair<const Def*, bool>> required_defs;
-std::set<const Def *> analyzed_conts;
-
-void enqueue(const Def* elem) {
+void Importer::enqueue(const Def* elem) {
     if (elem->isa_nom<Continuation>()) {
         if (analyzed_conts.find(elem) != analyzed_conts.end()) {
             required_defs.push(std::pair(elem, false));
diff --git a/src/thorin/transform/importer.h b/src/thorin/transform/importer.h
index eb7d5bc42..8d132a75b 100644
--- a/src/thorin/transform/importer.h
+++ b/src/thorin/transform/importer.h
@@ -4,6 +4,10 @@
 #include "thorin/world.h"
 #include "thorin/config.h"
 
+#include <set>
+#include <stack>
+#include <utility>
+
 namespace thorin {
 
 class Importer {
@@ -26,6 +30,10 @@ class Importer {
 
 private:
     const Def* import_nonrecursive();
+    void enqueue(const Def* elem);
+
+    std::stack<std::pair<const Def*, bool>> required_defs;
+    std::set<const Def*> analyzed_conts;
 
 public:
     Type2Type type_old2new_;