diff --git a/region.cpp b/region.cpp
index 067f000c..7bf4710e 100644
--- a/region.cpp
+++ b/region.cpp
@@ -63,7 +63,7 @@ util::region<S,T>::region (std::array<T,S*2> args)
 
 //-----------------------------------------------------------------------------
 template <size_t S, typename T>
-typename util::region<S,T>::size_type
+T
 util::region<S,T>::area (void) const
 {
     return e.area ();
@@ -72,7 +72,7 @@ util::region<S,T>::area (void) const
 
 //-----------------------------------------------------------------------------
 template <size_t S, typename T>
-typename util::region<S,T>::size_type
+T
 util::region<S,T>::diameter (void) const
 {
     return e.diameter ();
@@ -101,7 +101,7 @@ util::region<S,T>::magnitude (extent_t _e)
 //-----------------------------------------------------------------------------
 template <size_t S, typename T>
 void
-util::region<S,T>::scale (size_type factor)
+util::region<S,T>::scale (T factor)
 {
     auto o = (e * factor - e) / T(2);
     p -= o;
@@ -371,8 +371,8 @@ namespace util { namespace debug {
     struct validator<util::region<S,T>> {
         static bool is_valid (const util::region<S,T> &r)
         {
-            CHECK_GE (r.area (), 0u);
-            CHECK_GE (min (r.e), 0u);
+            CHECK_GE (r.area (), T{0});
+            CHECK_GE (min (r.e), T{0});
 
             return r.area () >= 0 && min (r.e) >= 0;
         }
diff --git a/region.hpp b/region.hpp
index d725d184..709d04fd 100644
--- a/region.hpp
+++ b/region.hpp
@@ -31,11 +31,8 @@ namespace util {
      */
     template <size_t S, typename T>
     struct region {
-        using position_type = T;
-        using size_type = typename try_unsigned<T>::type;
-
-        using extent_t = util::extent<S,size_type>;
-        using point_t  = util::point<S,position_type>;
+        using extent_t = util::extent<S,T>;
+        using point_t  = util::point<S,T>;
 
         using value_type = T;
 
@@ -66,12 +63,12 @@ namespace util {
         constexpr region<S,U> cast (void) const;
 
         //---------------------------------------------------------------------
-        size_type area     (void) const;
-        size_type diameter (void) const;
+        T area (void) const;
+        T diameter (void) const;
         extent_t magnitude (void) const;
         extent_t magnitude (extent_t);
 
-        void scale (size_type factor);
+        void scale (T factor);
 
         bool empty (void) const;
 
diff --git a/region.ipp b/region.ipp
index 38000f3e..a2cb318e 100644
--- a/region.ipp
+++ b/region.ipp
@@ -26,8 +26,8 @@ namespace util {
     region<S,T>::cast (void) const
     {
         return {
-            p.template cast<typename region<S,U>::position_type> (),
-            e.template cast<typename region<S,U>::size_type> ()
+            p.template cast<U> (),
+            e.template cast<U> ()
         };
     }
 }