diff --git a/sfizz/Buffer.h b/sfizz/Buffer.h
index ca4e5c6f..f1fc9294 100644
--- a/sfizz/Buffer.h
+++ b/sfizz/Buffer.h
@@ -42,7 +42,6 @@ public:
     using reverse_iterator = std::reverse_iterator<iterator>;
     using const_reverse_iterator = std::reverse_iterator<const_iterator>;
     using size_type = size_t;
-    using difference_type = ptrdiff_t;
 
     Buffer()
     {