diff --git a/tx/workers/expand.js b/tx/workers/expand.js
index 0756944..1f6050c 100644
--- a/tx/workers/expand.js
+++ b/tx/workers/expand.js
@@ -626,7 +626,7 @@ class ValueSetExpander {
           } else if (cs.contentMode() === 'supplement') {
             throw new Issue('error', 'business-rule', null, null, 'The code system definition for ' + cset.system + ' defines a supplement, so this expansion cannot be performed', 'invalid');
           } else if (this.params.incompleteOK) {
-            this.addParamUri(cs.contentMode, cs.system + '|' + cs.version);
+            this.addParamUri(cs.contentMode(), cs.system + '|' + cs.version);
           } else {
             throw new Issue('error', 'business-rule', null, null, 'The code system definition for ' + cset.system + ' is a ' + cs.contentMode() + ', so this expansion is not permitted unless the expansion parameter "incomplete-ok" has a value of "true"', 'invalid', 422);
           }
diff --git a/tx/workers/validate.js b/tx/workers/validate.js
index 2c71585..044fb1d 100644
--- a/tx/workers/validate.js
+++ b/tx/workers/validate.js
@@ -597,11 +597,11 @@ class ValueSetChecker {
         defLang.value = cs.defLang();
         this.checkCanonicalStatus(path, op, cs, this.valueSet);
         ver.value = cs.version();
-        contentMode.value = cs.contentMode;
+        contentMode.value = cs.contentMode();
         let ctxt = cs.locate(code);
         if (ctxt.context === null) {
           unkCodes.push(system + '|' + version + '#' + code);
-          if (cs.contentMode !== 'complete') {
+          if (cs.contentMode() !== 'complete') {
             result = true;
             cause.value = 'code-invalid';
             this.worker.opContext.addNote(this.valueSet, 'Not found in Incomplete Code System', this.indentCount);