diff --git a/src/libsystemd-bus/kdbus.h b/src/libsystemd-bus/kdbus.h
index 0589370125d..4b3acae0e4f 100644
--- a/src/libsystemd-bus/kdbus.h
+++ b/src/libsystemd-bus/kdbus.h
@@ -387,7 +387,7 @@ struct kdbus_cmd_match {
 
 struct kdbus_cmd_monitor {
 	__u64 id;		/* We allow setting the monitor flag of other peers */
-	int enabled;		/* A boolean to enable/disable monitoring */
+	unsigned int enabled;	/* A boolean to enable/disable monitoring */
 };
 
 /* FD states: