diff --git a/include/cubescript/cubescript.hh b/include/cubescript/cubescript.hh
index dfabf53..9a08de4 100644
--- a/include/cubescript/cubescript.hh
+++ b/include/cubescript/cubescript.hh
@@ -4,7 +4,6 @@
 #include "cubescript_conf.hh"
 
 #include "cubescript/platform.hh"
-#include "cubescript/callable.hh"
 #include "cubescript/error.hh"
 #include "cubescript/value.hh"
 #include "cubescript/ident.hh"
diff --git a/include/cubescript/cubescript/callable.hh b/include/cubescript/cubescript/callable.hh
index 96f90db..9a5e74c 100644
--- a/include/cubescript/cubescript/callable.hh
+++ b/include/cubescript/cubescript/callable.hh
@@ -8,6 +8,7 @@
 #include <memory>
 
 namespace cubescript {
+namespace internal {
 
 template<typename R, typename ...A>
 struct callable {
@@ -205,6 +206,7 @@ public:
     }
 };
 
+} /* namespace internal */
 } /* namespace cubescript */
 
 #endif /* LIBCUBESCRIPT_CUBESCRIPT_CALLABLE_HH */
diff --git a/include/cubescript/cubescript/state.hh b/include/cubescript/cubescript/state.hh
index 1a9c04f..43dbefc 100644
--- a/include/cubescript/cubescript/state.hh
+++ b/include/cubescript/cubescript/state.hh
@@ -13,8 +13,8 @@ namespace cubescript {
 
 using alloc_func   = void *(*)(void *, void *, size_t, size_t);
 
-using hook_func    = callable<void, struct state &>;
-using command_func = callable<
+using hook_func    = internal::callable<void, struct state &>;
+using command_func = internal::callable<
     void, struct state &, std::span<struct any_value>, struct any_value &
 >;