diff --git a/nixide-sys/libnixide-c/nixide_api_main.cc b/nixide-sys/libnixide-c/nixide_api_main.cc
index 2035bfc..18a5b43 100644
--- a/nixide-sys/libnixide-c/nixide_api_main.cc
+++ b/nixide-sys/libnixide-c/nixide_api_main.cc
@@ -13,7 +13,7 @@ nix_err nix_register_plugin(nix_c_context * context, char * plugin)
         context->last_err_code = NIX_OK;
     if (plugin == nullptr) {
         // TODO: should this be `NIX_ERR_RECOVERABLE` or `NIX_ERR_UNKNOWN`?
-        return nix_set_err_msg(context, NIX_ERR_RECOVERABLE, "Plugin is null");
+        return nix_set_err_msg(context, NIX_ERR_UNKNOWN, "Plugin is null");
     }
 
     void * handle = dlopen("libnixmainc.so", RTLD_LAZY | RTLD_GLOBAL);