diff --git a/libgrust/libproc_macro/proc_macro.cc b/libgrust/libproc_macro/proc_macro.cc
index b1e108e74eb17d75d97d18c22a42888082381139..293fc957038268808833b66b187e2673b94a3d7d 100644
--- a/libgrust/libproc_macro/proc_macro.cc
+++ b/libgrust/libproc_macro/proc_macro.cc
@@ -60,5 +60,5 @@ bridge_is_available ()
 } // namespace ProcMacro
 
 ProcMacro::from_str_function_t __gccrs_proc_macro_from_str_fn = nullptr;
-ProcMacro::is_available_t __gccrs_proc_macro_is_available_fn
+ProcMacro::BridgeState __gccrs_proc_macro_is_available_fn
   = ProcMacro::BridgeState::Unavailable;
diff --git a/libgrust/libproc_macro/registration.h b/libgrust/libproc_macro/registration.h
index 0074e993488eebff6abb5b4ddf1fd081a4024fcf..aba7edd81fbab7f4979dec7c89fd4c8e5ed56c5d 100644
--- a/libgrust/libproc_macro/registration.h
+++ b/libgrust/libproc_macro/registration.h
@@ -30,11 +30,10 @@
 namespace ProcMacro {
 
 using from_str_function_t = ProcMacro::TokenStream (*) (std::string &, bool &);
-using is_available_t = ProcMacro::BridgeState;
 
 } // namespace ProcMacro
 
 extern "C" ProcMacro::from_str_function_t __gccrs_proc_macro_from_str_fn;
-extern "C" ProcMacro::is_available_t __gccrs_proc_macro_is_available_fn;
+extern "C" ProcMacro::BridgeState __gccrs_proc_macro_is_available_fn;
 
 #endif /* !REGISTRATION_H */