diff --git a/STL_Extension/include/CGAL/Small_unordered_map.h b/STL_Extension/include/CGAL/Small_unordered_map.h
index 964aa0e7f6a..4272d16bb5b 100644
--- a/STL_Extension/include/CGAL/Small_unordered_map.h
+++ b/STL_Extension/include/CGAL/Small_unordered_map.h
@@ -87,7 +87,7 @@ public:
   const T& get_and_erase(const K& k) const
   {
     unsigned int h  = hash(k)%M;
-    int i = h;
+    unsigned int i = h;
     do{
       if((occupied[i] == 1) && (data[i].first == k)){
         occupied[i] = -1;