diff --git a/servers/slapd/overlays/collect.c b/servers/slapd/overlays/collect.c
index 680fb9b59f..f01045a958 100644
--- a/servers/slapd/overlays/collect.c
+++ b/servers/slapd/overlays/collect.c
@@ -42,20 +42,11 @@
  * is no effect. If no attribute was configured, there is no effect.
  */
 
-/* Use C99 flexible array member if supported, C89 "struct hack" otherwise. */
-#define FLEXIBLE_STRUCT_SIZE(stype, mtype, mcount) \
-	(sizeof(stype) + sizeof(mtype) * ((mcount) - (0 FLEXIBLE_ARRAY_MEMBER)))
-#if __STDC_VERSION__>=199901L || (defined __GNUC__ && !defined __STRICT_ANSI__)
-#define FLEXIBLE_ARRAY_MEMBER
-#else
-#define FLEXIBLE_ARRAY_MEMBER +1
-#endif
-
 typedef struct collect_info {
 	struct collect_info *ci_next;
 	struct berval ci_dn;
 	int ci_ad_num;
-	AttributeDescription *ci_ad[FLEXIBLE_ARRAY_MEMBER];
+	AttributeDescription *ci_ad[1];
 } collect_info;
 
 /*
@@ -184,8 +175,8 @@ collect_cf( ConfigArgs *c )
 		}
 
 		/* allocate config info with room for attribute array */
-		ci = ch_malloc( FLEXIBLE_STRUCT_SIZE( collect_info,
-			AttributeDescription *, count + 1 ));
+		ci = ch_malloc( sizeof( collect_info ) +
+			sizeof( AttributeDescription * ) * count );
 
 		/* validate and normalize dn */
 		ber_str2bv( c->argv[1], 0, 0, &bv );