diff --git a/src/inter.h b/src/inter.h
index a017a28..ed49a89 100644
--- a/src/inter.h
+++ b/src/inter.h
@@ -88,6 +88,9 @@ struct dict_entry {
 
 void global_dict_add_new(dict_entry&& e);
 
+using ffi1_table = std::array<ffi, T_MAX>;
+using ffi2_table = std::array<ffi1_table, T_MAX>;
+
 // interpreter
 
 using dict_t = std::vector<dict_entry>;
diff --git a/src/words.c++ b/src/words.c++
index b0c14b1..afdb329 100644
--- a/src/words.c++
+++ b/src/words.c++
@@ -10,9 +10,6 @@
 
 // common utilities
 
-using ffi1_table = std::array<ffi, T_MAX>;
-using ffi2_table = std::array<ffi1_table, T_MAX>;
-
 void global_dict_add_ffi1(str n, const ffi1_table& ffi) {
   global_dict_add_new({string(n), array::create(T_FFI, ffi.size(), ffi.begin())});
 }