diff --git a/lib/dns/qpcache.c b/lib/dns/qpcache.c
index 9d02239a24..c5de17203a 100644
--- a/lib/dns/qpcache.c
+++ b/lib/dns/qpcache.c
@@ -59,6 +59,7 @@
 
 #include "db_p.h"
 #include "qpcache_p.h"
+#include "rdataslab_p.h"
 
 #ifndef DNS_QPCACHE_LOG_STATS_LEVEL
 #define DNS_QPCACHE_LOG_STATS_LEVEL 3
@@ -71,37 +72,6 @@
 			goto failure;        \
 	} while (0)
 
-#define EXISTS(header)                                 \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_NONEXISTENT) == 0)
-#define NXDOMAIN(header)                               \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_NXDOMAIN) != 0)
-#define STALE(header)                                  \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_STALE) != 0)
-#define STALE_WINDOW(header)                           \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_STALE_WINDOW) != 0)
-#define OPTOUT(header)                                 \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_OPTOUT) != 0)
-#define NEGATIVE(header)                               \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_NEGATIVE) != 0)
-#define PREFETCH(header)                               \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_PREFETCH) != 0)
-#define ZEROTTL(header)                                \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_ZEROTTL) != 0)
-#define ANCIENT(header)                                \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_ANCIENT) != 0)
-#define STATCOUNT(header)                              \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_STATCOUNT) != 0)
-
 #define STALE_TTL(header, qpdb) \
 	(NXDOMAIN(header) ? 0 : qpdb->common.serve_stale_ttl)
 
diff --git a/lib/dns/qpzone.c b/lib/dns/qpzone.c
index 65f6c211b6..76eb96c9d5 100644
--- a/lib/dns/qpzone.c
+++ b/lib/dns/qpzone.c
@@ -62,6 +62,7 @@
 
 #include "db_p.h"
 #include "qpzone_p.h"
+#include "rdataslab_p.h"
 
 #define CHECK(op)                            \
 	do {                                 \
@@ -70,22 +71,6 @@
 			goto failure;        \
 	} while (0)
 
-#define EXISTS(header)                                 \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_NONEXISTENT) == 0)
-#define IGNORE(header)                                 \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_IGNORE) != 0)
-#define RESIGN(header)                                 \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_RESIGN) != 0)
-#define OPTOUT(header)                                 \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_OPTOUT) != 0)
-#define STATCOUNT(header)                              \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_STATCOUNT) != 0)
-
 #define HEADERNODE(h) ((qpznode_t *)((h)->node))
 
 #define QPDB_ATTR_LOADED  0x01
diff --git a/lib/dns/rdataslab.c b/lib/dns/rdataslab.c
index f5d4cb2454..82e810c3ef 100644
--- a/lib/dns/rdataslab.c
+++ b/lib/dns/rdataslab.c
@@ -30,18 +30,7 @@
 #include <dns/rdataslab.h>
 #include <dns/stats.h>
 
-#define CASESET(header)                                \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_CASESET) != 0)
-#define CASEFULLYLOWER(header)                         \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_CASEFULLYLOWER) != 0)
-#define NONEXISTENT(header)                            \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_NONEXISTENT) != 0)
-#define NEGATIVE(header)                               \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_NEGATIVE) != 0)
+#include "rdataslab_p.h"
 
 /*
  * The rdataslab structure allows iteration to occur in both load order
@@ -915,10 +904,10 @@ dns_slabheader_destroy(dns_slabheader_t **headerp) {
 	isc_mem_t *mctx = header->node->mctx;
 	dns_db_deletedata(header->node, header);
 
-	if (NONEXISTENT(header)) {
-		size = sizeof(*header);
-	} else {
+	if (EXISTS(header)) {
 		size = dns_rdataslab_size(header);
+	} else {
+		size = sizeof(*header);
 	}
 
 	isc_mem_put(mctx, header, size);
diff --git a/lib/dns/rdataslab_p.h b/lib/dns/rdataslab_p.h
new file mode 100644
index 0000000000..e3b4fbb573
--- /dev/null
+++ b/lib/dns/rdataslab_p.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#pragma once
+
+#include <dns/rdataslab.h>
+
+#define ANCIENT(header)                                \
+	((atomic_load_acquire(&(header)->attributes) & \
+	  DNS_SLABHEADERATTR_ANCIENT) != 0)
+#define CASEFULLYLOWER(header)                         \
+	((atomic_load_acquire(&(header)->attributes) & \
+	  DNS_SLABHEADERATTR_CASEFULLYLOWER) != 0)
+#define CASESET(header)                                \
+	((atomic_load_acquire(&(header)->attributes) & \
+	  DNS_SLABHEADERATTR_CASESET) != 0)
+#define EXISTS(header)                                 \
+	((atomic_load_acquire(&(header)->attributes) & \
+	  DNS_SLABHEADERATTR_NONEXISTENT) == 0)
+#define IGNORE(header)                                 \
+	((atomic_load_acquire(&(header)->attributes) & \
+	  DNS_SLABHEADERATTR_IGNORE) != 0)
+#define NEGATIVE(header)                               \
+	((atomic_load_acquire(&(header)->attributes) & \
+	  DNS_SLABHEADERATTR_NEGATIVE) != 0)
+#define NXDOMAIN(header)                               \
+	((atomic_load_acquire(&(header)->attributes) & \
+	  DNS_SLABHEADERATTR_NXDOMAIN) != 0)
+#define OPTOUT(header)                                 \
+	((atomic_load_acquire(&(header)->attributes) & \
+	  DNS_SLABHEADERATTR_OPTOUT) != 0)
+#define PREFETCH(header)                               \
+	((atomic_load_acquire(&(header)->attributes) & \
+	  DNS_SLABHEADERATTR_PREFETCH) != 0)
+#define RESIGN(header)                                 \
+	((atomic_load_acquire(&(header)->attributes) & \
+	  DNS_SLABHEADERATTR_RESIGN) != 0)
+#define STALE(header)                                  \
+	((atomic_load_acquire(&(header)->attributes) & \
+	  DNS_SLABHEADERATTR_STALE) != 0)
+#define STALE_WINDOW(header)                           \
+	((atomic_load_acquire(&(header)->attributes) & \
+	  DNS_SLABHEADERATTR_STALE_WINDOW) != 0)
+#define STATCOUNT(header)                              \
+	((atomic_load_acquire(&(header)->attributes) & \
+	  DNS_SLABHEADERATTR_STATCOUNT) != 0)
+#define ZEROTTL(header)                                \
+	((atomic_load_acquire(&(header)->attributes) & \
+	  DNS_SLABHEADERATTR_ZEROTTL) != 0)
diff --git a/tests/dns/qpzone_test.c b/tests/dns/qpzone_test.c
index 73cd7514a1..ad3d5b972a 100644
--- a/tests/dns/qpzone_test.c
+++ b/tests/dns/qpzone_test.c
@@ -34,6 +34,8 @@
 #include <dns/rdatastruct.h>
 #define KEEP_BEFORE
 
+#include "rdataslab_p.h"
+
 /* Include the main file */
 
 #pragma GCC diagnostic push
@@ -45,10 +47,6 @@
 #undef CHECK
 #include <tests/dns.h>
 
-#define CASESET(header)                                \
-	((atomic_load_acquire(&(header)->attributes) & \
-	  DNS_SLABHEADERATTR_CASESET) != 0)
-
 const char *ownercase_vectors[12][2] = {
 	{
 		"AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz",