diff --git a/src/core/manager.c b/src/core/manager.c
index 7938c989af..594e7bc2c7 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -113,7 +113,7 @@
 /* How many units and jobs to process of the bus queue before returning to the event loop. */
 #define MANAGER_BUS_MESSAGE_BUDGET 100U
 
-#define DEFAULT_TASKS_MAX ((CGroupTasksMax) { 15U, 100U }) /* 15% */
+#define DEFAULT_TASKS_MAX ((const CGroupTasksMax) { 15U, 100U }) /* 15% */
 
 static int manager_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata);
 static int manager_dispatch_signal_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata);