diff --git a/src/random.h b/src/random.h
index f85ca167..7b6ba2f9 100644
--- a/src/random.h
+++ b/src/random.h
@@ -46,6 +46,7 @@ namespace etl
     {
     }
 
+    virtual void initialise(uint32_t seed) = 0;
     virtual uint32_t operator()() = 0;
   };