diff --git a/lib/Figments/MainLoop.h b/lib/Figments/MainLoop.h
index 5cc71a3..38e12b3 100644
--- a/lib/Figments/MainLoop.h
+++ b/lib/Figments/MainLoop.h
@@ -21,7 +21,7 @@ struct Scheduler {
 
     struct iterator: public std::iterator<std::input_iterator_tag, Task*> {
         Scheduler& queue;
-        int idx = 0;
+        size_t idx = 0;
         explicit iterator(Scheduler& queue) : queue(queue), idx(nextEnabled(0)) {}
         iterator(Scheduler& queue, int start) : queue(queue), idx(nextEnabled(start)) {}
         iterator& operator++() {
@@ -33,7 +33,7 @@ struct Scheduler {
         }
 
         int nextEnabled(int start) const {
-            for(int pos = start; pos < queue.tasks.size();pos++) {
+            for(size_t pos = start; pos < queue.tasks.size();pos++) {
                 if (queue.tasks[pos]->state == Task::Running) {
                     return pos;
                 }