diff --git a/src/mms/iso_client/iso_client_connection.c b/src/mms/iso_client/iso_client_connection.c
index b68631b0..6f6d48f6 100644
--- a/src/mms/iso_client/iso_client_connection.c
+++ b/src/mms/iso_client/iso_client_connection.c
@@ -351,7 +351,6 @@ IsoClientConnection_associate(IsoClientConnection self, IsoConnectionParameters
         goto returnError;
     }
 
-
     ByteBuffer_wrap(self->receivePayloadBuffer, self->acseConnection.userDataBuffer,
             self->acseConnection.userDataBufferSize, self->acseConnection.userDataBufferSize);
 
diff --git a/src/mms/iso_cotp/cotp.c b/src/mms/iso_cotp/cotp.c
index a29c8378..c9165afc 100644
--- a/src/mms/iso_cotp/cotp.c
+++ b/src/mms/iso_cotp/cotp.c
@@ -449,6 +449,8 @@ CotpConnection_init(CotpConnection* self, Socket socket,
 	self->options.tSelDst = tsel;
     self->payload = payloadBuffer;
 
+    CotpConnection_resetPayload(self);
+
     /* default TPDU size is maximum size */
     CotpConnection_setTpduSize(self, COTP_MAX_TPDU_SIZE);