diff --git a/src/libsystemd/sd-device/device-private.c b/src/libsystemd/sd-device/device-private.c
index cfe4af0fcc..bc7a838608 100644
--- a/src/libsystemd/sd-device/device-private.c
+++ b/src/libsystemd/sd-device/device-private.c
@@ -664,7 +664,7 @@ int device_rename(sd_device *device, const char *name) {
         return device_add_property_internal(device, "INTERFACE", name);
 }
 
-int device_shallow_clone(sd_device *device, sd_device **ret) {
+static int device_shallow_clone(sd_device *device, sd_device **ret) {
         _cleanup_(sd_device_unrefp) sd_device *dest = NULL;
         const char *val = NULL;
         int r;
diff --git a/src/libsystemd/sd-device/device-private.h b/src/libsystemd/sd-device/device-private.h
index 6e96cc264a..a59f130aff 100644
--- a/src/libsystemd/sd-device/device-private.h
+++ b/src/libsystemd/sd-device/device-private.h
@@ -54,7 +54,6 @@ int device_get_properties_nulstr(sd_device *device, const char **ret_nulstr, siz
 int device_get_properties_strv(sd_device *device, char ***ret);
 
 int device_rename(sd_device *device, const char *name);
-int device_shallow_clone(sd_device *device, sd_device **ret);
 int device_clone_with_db(sd_device *device, sd_device **ret);
 
 int device_tag_index(sd_device *dev, sd_device *dev_old, bool add);