diff --git a/src/pv/transfer.c b/src/pv/transfer.c
index 4b390d7..f4422a2 100644
--- a/src/pv/transfer.c
+++ b/src/pv/transfer.c
@@ -804,7 +804,7 @@ static int pv__transfer_write(pvstate_t state, bool *eof_in, bool *eof_out, long
 	 */
 	if ((0 == nwritten) || (EINTR == errno) || (EAGAIN == errno)) {
 		if (0 == nwritten) {
-			debug("%s", "write returned zero - waiting briefly", strerror(errno));
+			debug("%s", "write returned zero - waiting briefly");
 		} else {
 			debug("%s: %s", "transient write error - waiting briefly", strerror(errno));
 		}