diff --git a/image.hpp b/image.hpp
index 8d23c812..b63cafea 100644
--- a/image.hpp
+++ b/image.hpp
@@ -51,7 +51,7 @@ namespace util { namespace image {
 
         //---------------------------------------------------------------------
         constexpr extent2u extent (void) const;
-        constexpr extent2u stride (void) const;
+        constexpr vector2u stride (void) const;
         constexpr size_t   size   (void) const; // elements allocated
 
         constexpr bool is_packed (void) const;
diff --git a/image.ipp b/image.ipp
index c1018d6b..7bc798b3 100644
--- a/image.ipp
+++ b/image.ipp
@@ -31,7 +31,7 @@ namespace util { namespace image {
 
     //-------------------------------------------------------------------------
     template <typename T>
-    constexpr extent2u
+    constexpr vector2u
     buffer<T>::stride (void) const
     {
         return { 1, s };