diff --git a/tools/bifcl/builtin-func.l b/tools/bifcl/builtin-func.l
index 841168ca6b..bd5c2e7f9e 100644
--- a/tools/bifcl/builtin-func.l
+++ b/tools/bifcl/builtin-func.l
@@ -280,7 +280,7 @@ void init_alternative_mode()
 		fprintf(fp_func_register, "\n");
 		fprintf(fp_func_register, "namespace plugin { namespace %s {\n", plugin_canon);
 		fprintf(fp_func_register, "void __bif_%s_init(zeek::plugin::Plugin* plugin);\n", name);
-		fprintf(fp_func_register, "zeek::detail::plugin::__RegisterBif __register_bifs_%s_%s(\"%s\", __bif_%s_init);\n", plugin_canon, name, plugin, name);
+		fprintf(fp_func_register, "zeek::plugin::detail::__RegisterBif __register_bifs_%s_%s(\"%s\", __bif_%s_init);\n", plugin_canon, name, plugin, name);
 		fprintf(fp_func_register, "} }\n");
         }
 	}