diff --git a/CHANGES b/CHANGES
index d5387d8b5dcbbaf420698e9af667f5c8dc931164..abc80c7933cf3c0f1c98e36f28b098a9e5b90f71 100644
--- a/CHANGES
+++ b/CHANGES
@@ -11,7 +11,8 @@ OpenLDAP 2.4.13 Engineering
 	Added slapd-bdb/hdb dbpagesize keyword
 	Added slapd-bdb/hdb checksum keyword
 	Fixed slapo-chain/translucent back-config support (ITS#5736)
-	Fixed slapd-chain segv with search references (ITS#5742)
+	Fixed slapo-chain segv with search references (ITS#5742)
+	Fixed slapo-collect compile with C89 (ITS#5747)
 	Added slapo-constraint support for LDAP URI constraints (ITS#5704)
 	Added slapo-constraint support for constraining rename (ITS#5703)
 	Added slapo-constraint support for relax control (ITS#5705)
diff --git a/servers/slapd/overlays/collect.c b/servers/slapd/overlays/collect.c
index 4852022f95da3d793ccab842c0212ad8d219426e..f01045a958b7adf73adee725e8b527b7c86f3fe6 100644
--- a/servers/slapd/overlays/collect.c
+++ b/servers/slapd/overlays/collect.c
@@ -46,7 +46,7 @@ typedef struct collect_info {
 	struct collect_info *ci_next;
 	struct berval ci_dn;
 	int ci_ad_num;
-	AttributeDescription *ci_ad[];
+	AttributeDescription *ci_ad[1];
 } collect_info;
 
 /*
@@ -176,7 +176,7 @@ collect_cf( ConfigArgs *c )
 
 		/* allocate config info with room for attribute array */
 		ci = ch_malloc( sizeof( collect_info ) +
-			( sizeof (AttributeDescription *) * (count + 1)));
+			sizeof( AttributeDescription * ) * count );
 
 		/* validate and normalize dn */
 		ber_str2bv( c->argv[1], 0, 0, &bv );