1 files changed, 3 insertions, 0 deletions
diff --git a/bpkg/types b/bpkg/types
index 2ab7aea..4110ed8 100644
--- a/bpkg/types
+++ b/bpkg/types
@@ -10,6 +10,7 @@
 #include <ostream>
 
 #include <butl/path>
+#include <butl/optional>
 
 namespace bpkg
 {
@@ -20,6 +21,8 @@ namespace bpkg
   using strings = std::vector<string>;
   using cstrings = std::vector<const char*>;
 
+  using butl::optional;
+
   // <butl/path>
   //
   using butl::path;