diff --git a/include/bitcoin/system/impl/machine/interpreter.ipp b/include/bitcoin/system/impl/machine/interpreter.ipp
index 3823be2d79..7617cf997d 100644
--- a/include/bitcoin/system/impl/machine/interpreter.ipp
+++ b/include/bitcoin/system/impl/machine/interpreter.ipp
@@ -291,7 +291,7 @@ op_dup2() NOEXCEPT
     if (state::stack_size() < 2)
         return error::op_dup2;
 
-    // [0,1,2,3] => 1, [0,1,2,3] =>  0,1,[0,1,2,3]
+    // [0,1,2,3] => 1,[0,1,2,3] =>  0,1,[0,1,2,3]
     state::push_variant(state::peek_(1));
     state::push_variant(state::peek_(1));
     return error::op_success;
diff --git a/include/bitcoin/system/stream/streams.hpp b/include/bitcoin/system/stream/streams.hpp
index f1fe085184..65fe5889bd 100644
--- a/include/bitcoin/system/stream/streams.hpp
+++ b/include/bitcoin/system/stream/streams.hpp
@@ -57,7 +57,7 @@ namespace stream
         using copy = make_stream<copy_sink<data_slab>>;
 
         /// A fast output stream that copies data to a data_slab.
-        using fast = system:: ostream<>;
+        using fast = system::ostream<>;
 
         /// A std::output stream that inserts data to a container.
         template <typename Container>