diff --git a/CHANGES b/CHANGES
index 841fe3c13f..fca251a94a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+4528.	[bug]		Only set the flag bits for the i/o we are waiting
+			for on EPOLLERR or EPOLLHUP. [RT #43617]
+
 4527.	[doc]		Support DocBook XSL Stylesheets v1.79.1. [RT #43831]
 
 4526.	[doc]		Corrected errors and improved formatting of
diff --git a/lib/isc/unix/socket.c b/lib/isc/unix/socket.c
index 15900dc0bf..f24e280779 100644
--- a/lib/isc/unix/socket.c
+++ b/lib/isc/unix/socket.c
@@ -3774,7 +3774,8 @@ process_fds(isc__socketmgr_t *manager, struct epoll_event *events, int nevents)
 			 * events.  Note also that the read or write attempt
 			 * won't block because we use non-blocking sockets.
 			 */
-			events[i].events |= (EPOLLIN | EPOLLOUT);
+			int fd = events[i].data.fd;
+			events[i].events |= manager->epoll_events[fd];
 		}
 		process_fd(manager, events[i].data.fd,
 			   (events[i].events & EPOLLIN) != 0,