diff --git a/src/backend/access/common/printtup.c b/src/backend/access/common/printtup.c
index dd1bac0..a9315c6 100644
--- a/src/backend/access/common/printtup.c
+++ b/src/backend/access/common/printtup.c
@@ -438,11 +438,12 @@ printtup(TupleTableSlot *slot, DestReceiver *self)
 		{
 			/* Binary output */
 			bytea	   *outputbytes;
+			int			outputlen;
 
 			outputbytes = SendFunctionCall(&thisState->finfo, attr);
-			pq_sendint32(buf, VARSIZE(outputbytes) - VARHDRSZ);
-			pq_sendbytes(buf, VARDATA(outputbytes),
-						 VARSIZE(outputbytes) - VARHDRSZ);
+			outputlen = VARSIZE(outputbytes) - VARHDRSZ;
+			pq_sendint32(buf, outputlen);
+			pq_sendbytes(buf, VARDATA(outputbytes), outputlen);
 		}
 	}