diff --git a/src/core/scope.c b/src/core/scope.c
index 8fdba646aa..74f16233c5 100644
--- a/src/core/scope.c
+++ b/src/core/scope.c
@@ -52,7 +52,7 @@ static void scope_done(Unit *u) {
         s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
 }
 
-static int scope_running_timeout(Scope *s) {
+static usec_t scope_running_timeout(Scope *s) {
         usec_t delta = 0;
 
         assert(s);
diff --git a/src/core/service.c b/src/core/service.c
index 68485a241f..9299813d45 100644
--- a/src/core/service.c
+++ b/src/core/service.c
@@ -515,7 +515,7 @@ static void service_remove_fd_store(Service *s, const char *name) {
         }
 }
 
-static int service_running_timeout(Service *s) {
+static usec_t service_running_timeout(Service *s) {
         usec_t delta = 0;
 
         assert(s);