diff --git a/Common/RepeaterHandler.cpp b/Common/RepeaterHandler.cpp
index f687e6f..64257a0 100644
--- a/Common/RepeaterHandler.cpp
+++ b/Common/RepeaterHandler.cpp
@@ -743,7 +743,7 @@ void CRepeaterHandler::processRepeater(CAMBEData& data)
 	// Check for the fast data signature
 	if (!m_fastData) {
 		unsigned char slowDataType = (buffer[VOICE_FRAME_LENGTH_BYTES] ^ SCRAMBLER_BYTE1) & SLOW_DATA_TYPE_MASK;
-		unsigned char guard = data[4U] ^ SCRAMBLER_BYTE5;
+		unsigned char guard = buffer[4U] ^ SCRAMBLER_BYTE5;
 		if ((slowDataType == SLOW_DATA_TYPE_FAST_DATA1 || slowDataType == SLOW_DATA_TYPE_FAST_DATA2) && guard == FAST_DATA_GUARD_BYTE)
 			m_fastData = true;
 	}