diff --git a/src/mode/cam/client.js b/src/mode/cam/client.js
index 2bf4f16d..c21a3ccc 100644
--- a/src/mode/cam/client.js
+++ b/src/mode/cam/client.js
@@ -831,7 +831,7 @@
             dogbones: UC.newBoolean(LANG.co_dogb_s, undefined, {title:LANG.co_dogb_l, show:(op) => { return !op.inputs.wide.checked }}),
             inside:   UC.newBoolean(LANG.co_olin_s, undefined, {title:LANG.co_olin_l, show:(op) => { return !op.inputs.outside.checked }}),
             outside:  UC.newBoolean(LANG.co_olot_s, undefined, {title:LANG.co_olot_l, show:(op) => { return !op.inputs.inside.checked }}),
-            omitthru: UC.newBoolean(LANG.co_omit_s, undefined, {title:LANG.co_omit_l, show:(op) => { return op.inputs.outside.checked }}),
+            omitthru: UC.newBoolean(LANG.co_omit_s, undefined, {title:LANG.co_omit_l, xshow:(op) => { return op.inputs.outside.checked }}),
             wide:     UC.newBoolean(LANG.co_wide_s, undefined, {title:LANG.co_wide_l, show:(op) => { return !op.inputs.inside.checked }})
         };
 
diff --git a/src/mode/cam/ops.js b/src/mode/cam/ops.js
index 0c8d515a..4174ae21 100644
--- a/src/mode/cam/ops.js
+++ b/src/mode/cam/ops.js
@@ -467,7 +467,7 @@
                     tops = tshadow;
                 }
 
-                if (op.outside && op.omitthru) {
+                if (op.omitthru) {
                     // eliminate thru holes from shadow
                     for (let hole of thruHoles) {
                         for (let top of tops) {