diff --git a/servers/slapd/back-shell/result.c b/servers/slapd/back-shell/result.c
index 4713d3057c..b9a8af9763 100644
--- a/servers/slapd/back-shell/result.c
+++ b/servers/slapd/back-shell/result.c
@@ -80,7 +80,7 @@ read_and_send_results(
 		}
 
 		len = strlen( line );
-		while ( bp + len - buf > bsize ) {
+		while ( bp + len + 1 - buf > bsize ) {
 			size_t offset = bp - buf;
 			bsize += BUFSIZ;
 			buf = (char *) ch_realloc( buf, bsize );
diff --git a/servers/slapd/back-sock/result.c b/servers/slapd/back-sock/result.c
index f6fcad35ce..537d5bc78e 100644
--- a/servers/slapd/back-sock/result.c
+++ b/servers/slapd/back-sock/result.c
@@ -77,7 +77,7 @@ sock_read_and_send_results(
 		}
 
 		len = strlen( line );
-		while ( bp + len - buf > bsize ) {
+		while ( bp + len + 1 - buf > bsize ) {
 			size_t offset = bp - buf;
 			bsize += BUFSIZ;
 			buf = (char *) ch_realloc( buf, bsize );