diff --git a/luamml.dtx b/luamml.dtx
index a5579e0..f2c85fd 100644
--- a/luamml.dtx
+++ b/luamml.dtx
@@ -771,7 +771,7 @@
 % This should only be done for specific environments, we define
 % a constant to test: 
 %    \begin{macrocode}
-\str_if_exist:cF { l__socket_tagsupport/math/luamml/mtable/tag/begin_plug_str }
+\str_if_exist:cF { l__socket_tagsupport/math/display/tag/begin_plug_str }
  {
    \NewSocket{tagsupport/math/display/tag/begin}{0}
    \NewSocket{tagsupport/math/display/tag/end}{0}