diff --git a/src/modules/module-rt.c b/src/modules/module-rt.c
index 0108596fc..2182c894a 100644
--- a/src/modules/module-rt.c
+++ b/src/modules/module-rt.c
@@ -1006,7 +1006,7 @@ static int do_rtkit_setup(struct spa_loop *loop, bool async, uint32_t seq,
 }
 #endif /* HAVE_DBUS */
 
-int set_uclamp(int uclamp_min, int uclamp_max, pid_t pid) {
+static int set_uclamp(int uclamp_min, int uclamp_max, pid_t pid) {
 #ifdef __linux__
 	int ret;
 	struct sched_attr {