diff --git a/src/helpers/radiolib/CustomLR1121Wrapper.h b/src/helpers/radiolib/CustomLR1121Wrapper.h
index ec3833248..f2e0d9c7e 100644
--- a/src/helpers/radiolib/CustomLR1121Wrapper.h
+++ b/src/helpers/radiolib/CustomLR1121Wrapper.h
@@ -38,7 +38,7 @@ public:
 
   void onSendFinished() override {
     RadioLibWrapper::onSendFinished();
-    _radio->setPreambleLength(16);
+    _radio->setPreambleLength(preambleLengthForSF(getSpreadingFactor()));
   }
 
   float getLastRSSI() const override {