diff --git a/src/js/msp/MSPHelper.js b/src/js/msp/MSPHelper.js
index cbc50510..bde71e95 100644
--- a/src/js/msp/MSPHelper.js
+++ b/src/js/msp/MSPHelper.js
@@ -1935,9 +1935,12 @@ MspHelper.prototype.sendModeRanges = function(onCompleteCallback) {
             .push8(modeRange.id)
             .push8(modeRange.auxChannelIndex)
             .push8((modeRange.range.start - 900) / 25)
-            .push8((modeRange.range.end - 900) / 25)
-            .push8(modeRangeExtra.modeLogic)
-            .push8(modeRangeExtra.linkedTo);
+            .push8((modeRange.range.end - 900) / 25);
+
+        if (semver.gte(CONFIG.apiVersion, "1.41.0")) {
+            buffer.push8(modeRangeExtra.modeLogic)
+                .push8(modeRangeExtra.linkedTo);
+        }
 
         // prepare for next iteration
         modeRangeIndex++;