diff --git a/src/systemd/sd-bus-protocol.h b/src/systemd/sd-bus-protocol.h
index a3f4e74359..8883ec62b9 100644
--- a/src/systemd/sd-bus-protocol.h
+++ b/src/systemd/sd-bus-protocol.h
@@ -94,6 +94,12 @@ enum {
 #define SD_BUS_ERROR_INTERACTIVE_AUTHORIZATION_REQUIRED \
                                                 "org.freedesktop.DBus.Error.InteractiveAuthorizationRequired"
 
+/* https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-marshaling-signature */
+#define SD_BUS_MAXIMUM_SIGNATURE_LENGTH 255
+
+/* https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names */
+#define SD_BUS_MAXIMUM_NAME_LENGTH 255
+
 _SD_END_DECLARATIONS;
 
 #endif
diff --git a/src/systemd/sd-bus.h b/src/systemd/sd-bus.h
index 787bc71271..9c37e7e6c9 100644
--- a/src/systemd/sd-bus.h
+++ b/src/systemd/sd-bus.h
@@ -34,12 +34,6 @@ _SD_BEGIN_DECLARATIONS;
 #define SD_BUS_DEFAULT_USER ((sd_bus *) 2)
 #define SD_BUS_DEFAULT_SYSTEM ((sd_bus *) 3)
 
-/* https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-marshaling-signature */
-#define SD_BUS_MAXIMUM_SIGNATURE_LENGTH 255
-
-/* https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names */
-#define SD_BUS_MAXIMUM_NAME_LENGTH 255
-
 /* Types */
 
 typedef struct sd_bus sd_bus;