diff --git a/projects/main/src/taoensso/telemere/impl.cljc b/projects/main/src/taoensso/telemere/impl.cljc
index 8e2614a..33e084d 100644
--- a/projects/main/src/taoensso/telemere/impl.cljc
+++ b/projects/main/src/taoensso/telemere/impl.cljc
@@ -234,7 +234,7 @@
 (defrecord Signal
   ;; Telemere's main public data type, we avoid nesting and duplication
   [schema inst uid,
-   location ns line column file, host thread _otel-context,
+   location ns line column file, #?@(:clj [host thread _otel-context]),
    sample-rate, kind id level, ctx parent root, data kvs msg_,
    error run-form run-val end-inst run-nsecs]
  
@@ -628,9 +628,9 @@
                            (let   [clause [(if run-form :run :no-run) (if clj? :clj :cljs)]]
                              (case clause
                                [:run    :clj ]  `(Signal. 1 ~'__inst ~'__uid, ~location ~'__ns ~line-form ~column-form ~file-form, (enc/host-info) ~'__thread ~'__otel-context1, ~sample-rate-form, ~'__kind ~'__id ~'__level, ~ctx-form ~parent-form ~'__root1, ~data-form ~kvs-form ~'_msg_,   ~'_run-err  '~run-form ~'_run-val ~'_end-inst ~'_run-nsecs)
-                               [:run    :cljs]  `(Signal. 1 ~'__inst ~'__uid, ~location ~'__ns ~line-form ~column-form ~file-form, nil             nil        nil                ~sample-rate-form, ~'__kind ~'__id ~'__level, ~ctx-form ~parent-form ~'__root1, ~data-form ~kvs-form ~'_msg_,   ~'_run-err  '~run-form ~'_run-val ~'_end-inst ~'_run-nsecs)
+                               [:run    :cljs]  `(Signal. 1 ~'__inst ~'__uid, ~location ~'__ns ~line-form ~column-form ~file-form,                                               ~sample-rate-form, ~'__kind ~'__id ~'__level, ~ctx-form ~parent-form ~'__root1, ~data-form ~kvs-form ~'_msg_,   ~'_run-err  '~run-form ~'_run-val ~'_end-inst ~'_run-nsecs)
                                [:no-run :clj ]  `(Signal. 1 ~'__inst ~'__uid, ~location ~'__ns ~line-form ~column-form ~file-form, (enc/host-info) ~'__thread ~'__otel-context1, ~sample-rate-form, ~'__kind ~'__id ~'__level, ~ctx-form ~parent-form ~'__root1, ~data-form ~kvs-form ~msg-form, ~error-form nil        nil        nil         nil)
-                               [:no-run :cljs]  `(Signal. 1 ~'__inst ~'__uid, ~location ~'__ns ~line-form ~column-form ~file-form, nil             nil        nil                ~sample-rate-form, ~'__kind ~'__id ~'__level, ~ctx-form ~parent-form ~'__root1, ~data-form ~kvs-form ~msg-form, ~error-form nil        nil        nil         nil)
+                               [:no-run :cljs]  `(Signal. 1 ~'__inst ~'__uid, ~location ~'__ns ~line-form ~column-form ~file-form,                                               ~sample-rate-form, ~'__kind ~'__id ~'__level, ~ctx-form ~parent-form ~'__root1, ~data-form ~kvs-form ~msg-form, ~error-form nil        nil        nil         nil)
                                (enc/unexpected-arg! clause {:context :signal-constructor-args})))
 
                            record-form