diff --git a/src/basic/dns-def.h b/src/basic/dns-def.h
new file mode 100644
index 00000000000..d70220bcc0e
--- /dev/null
+++ b/src/basic/dns-def.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+/* Length of a single label, with all escaping removed, excluding any trailing dot or NUL byte */
+#define DNS_LABEL_MAX 63
+
+/* Worst case length of a single label, with all escaping applied and room for a trailing NUL byte. */
+#define DNS_LABEL_ESCAPED_MAX (DNS_LABEL_MAX*4+1)
+
+/* Maximum length of a full hostname, consisting of a series of unescaped labels, and no trailing dot or NUL byte */
+#define DNS_HOSTNAME_MAX 253
+
+/* Maximum length of a full hostname, on the wire, including the final NUL byte */
+#define DNS_WIRE_FORMAT_HOSTNAME_MAX 255
+
+/* Maximum number of labels per valid hostname */
+#define DNS_N_LABELS_MAX 127
diff --git a/src/basic/meson.build b/src/basic/meson.build
index c7d6872fbf8..9b3366c5e9f 100644
--- a/src/basic/meson.build
+++ b/src/basic/meson.build
@@ -42,6 +42,7 @@ basic_sources = files('''
         dirent-util.h
         dlfcn-util.c
         dlfcn-util.h
+        dns-def.h
         efivars.c
         efivars.h
         env-file.c
diff --git a/src/libsystemd/sd-resolve/sd-resolve.c b/src/libsystemd/sd-resolve/sd-resolve.c
index 2cfa22d280b..6dae398acbc 100644
--- a/src/libsystemd/sd-resolve/sd-resolve.c
+++ b/src/libsystemd/sd-resolve/sd-resolve.c
@@ -15,7 +15,7 @@
 #include "sd-resolve.h"
 
 #include "alloc-util.h"
-#include "dns-domain.h"
+#include "dns-def.h"
 #include "errno-util.h"
 #include "fd-util.h"
 #include "io-util.h"
diff --git a/src/shared/dns-domain.h b/src/shared/dns-domain.h
index 77f596294de..c25fcaacc2a 100644
--- a/src/shared/dns-domain.h
+++ b/src/shared/dns-domain.h
@@ -6,24 +6,10 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include "dns-def.h"
 #include "hashmap.h"
 #include "in-addr-util.h"
 
-/* Length of a single label, with all escaping removed, excluding any trailing dot or NUL byte */
-#define DNS_LABEL_MAX 63
-
-/* Worst case length of a single label, with all escaping applied and room for a trailing NUL byte. */
-#define DNS_LABEL_ESCAPED_MAX (DNS_LABEL_MAX*4+1)
-
-/* Maximum length of a full hostname, consisting of a series of unescaped labels, and no trailing dot or NUL byte */
-#define DNS_HOSTNAME_MAX 253
-
-/* Maximum length of a full hostname, on the wire, including the final NUL byte */
-#define DNS_WIRE_FORMAT_HOSTNAME_MAX 255
-
-/* Maximum number of labels per valid hostname */
-#define DNS_N_LABELS_MAX 127
-
 typedef enum DNSLabelFlags {
         DNS_LABEL_LDH                = 1 << 0, /* Follow the "LDH" rule — only letters, digits, and internal hyphens. */
         DNS_LABEL_NO_ESCAPES         = 1 << 1, /* Do not treat backslashes specially */