diff --git a/DMRTX.cpp b/DMRTX.cpp
index 2670369..b9007c0 100644
--- a/DMRTX.cpp
+++ b/DMRTX.cpp
@@ -268,7 +268,7 @@ void CDMRTX::createCACH(uint8_t txSlotIndex, uint8_t rxSlotIndex)
   ::memcpy(m_poBuffer, m_shortLC + m_cachPtr, 3U);
   m_markBuffer[0U] = MARK_NONE;
   m_markBuffer[1U] = MARK_NONE;
-  m_markBuffer[2U] = rxSlotIndex == 1U ? MARK_SLOT2 : MARK_SLOT1;
+  m_markBuffer[2U] = rxSlotIndex == 1U ? MARK_SLOT1 : MARK_SLOT2;
 
   bool at = m_fifo[rxSlotIndex].getData() > 0U;
   bool tc = txSlotIndex == 1U;