diff --git a/noise/fractal/base.hpp b/noise/fractal/base.hpp
index 6d8ae58d..be93413d 100644
--- a/noise/fractal/base.hpp
+++ b/noise/fractal/base.hpp
@@ -61,6 +61,9 @@ namespace util { namespace noise { namespace fractal {
         constexpr seed_t seed (void) const;
         seed_t seed (seed_t);
 
+        const B& basis (void) const;
+        B& basis (void);
+
     protected:
         unsigned m_octaves;
         T m_H;
diff --git a/noise/fractal/base.ipp b/noise/fractal/base.ipp
index 8918f71e..e51abf06 100644
--- a/noise/fractal/base.ipp
+++ b/noise/fractal/base.ipp
@@ -141,4 +141,22 @@ namespace util { namespace noise { namespace fractal {
     {
         return m_basis.seed ();
     }
+
+
+    //-------------------------------------------------------------------------
+    template <typename T, typename B>
+    const B&
+    base<T,B>::basis (void) const
+    {
+        return m_basis;
+    }
+
+
+    //-------------------------------------------------------------------------
+    template <typename T, typename B>
+    B&
+    base<T,B>::basis (void)
+    {
+        return m_basis;
+    }
 } } }