diff --git a/servers/slapd/daemon.c b/servers/slapd/daemon.c
index b88f1e2b9a..823e6bd0b3 100644
--- a/servers/slapd/daemon.c
+++ b/servers/slapd/daemon.c
@@ -45,8 +45,14 @@ Listener **slap_listeners = NULL;
 
 static ber_socket_t wake_sds[2];
 
+#ifdef NO_THREADS
+static int waking;
+#define WAKE_LISTENER(w) \
+((w && !waking) ? tcp_write( wake_sds[1], "0", 1 ), waking=1 : 0)
+#else
 #define WAKE_LISTENER(w) \
 do { if (w) tcp_write( wake_sds[1], "0", 1 ); } while(0)
+#endif
 
 #ifdef HAVE_NT_SERVICE_MANAGER
 /* in nt_main.c */
@@ -594,6 +600,9 @@ slapd_daemon_task(
 		if( FD_ISSET( wake_sds[0], &readfds ) ) {
 			char c[BUFSIZ];
 			tcp_read( wake_sds[0], c, sizeof(c) );
+#ifdef NO_THREADS
+			waking = 0;
+#endif
 			continue;
 		}