diff --git a/p25/TrunkPacket.cpp b/p25/TrunkPacket.cpp
index 5f518ea8..b0024e00 100644
--- a/p25/TrunkPacket.cpp
+++ b/p25/TrunkPacket.cpp
@@ -2007,7 +2007,7 @@ void TrunkPacket::queueRF_TSBK_Ctrl(uint8_t lco)
         writeRF_TSDU_MBF();
     }
     else {
-        writeRF_TSDU_SBF(false);
+        writeRF_TSDU_SBF(true);
     }
 }