diff --git a/src/libsystemd/sd-device/device-internal.h b/src/libsystemd/sd-device/device-internal.h
index c1a81e3b41..c7f9b59087 100644
--- a/src/libsystemd/sd-device/device-internal.h
+++ b/src/libsystemd/sd-device/device-internal.h
@@ -69,7 +69,7 @@ struct sd_device {
 
         char *id_filename;
 
-        uint64_t usec_initialized;
+        usec_t usec_initialized;
 
         mode_t devmode;
         uid_t devuid;