diff --git a/P25Defines.h b/P25Defines.h
index 96dca3f..815f75a 100644
--- a/P25Defines.h
+++ b/P25Defines.h
@@ -55,7 +55,7 @@ const unsigned int  P25_PDU_FEC_LENGTH_BITS          = P25_PDU_FEC_LENGTH_BYTES
 
 const unsigned int  P25_MI_LENGTH_BYTES = 9U;
 
-const unsigned char P25_ALGO_UNENCRYPT = 0x81U;
+const unsigned char P25_ALGO_UNENCRYPT = 0x80U;
 
 const unsigned char P25_LCF_GROUP   = 0x00U;
 const unsigned char P25_LCF_PRIVATE = 0x03U;