diff --git a/src/libs/memsinksh.c b/src/libs/memsinksh.c
index 47725fd..5fc576f 100644
--- a/src/libs/memsinksh.c
+++ b/src/libs/memsinksh.c
@@ -71,7 +71,7 @@ u8 *us_memsinksh_get_data(us_memsink_shared_s *mem) {
 	return (u8*)(mem) + sizeof(us_memsink_shared_s);
 }
 
-bool us_memsinksh_has_clients(us_memsink_shared_s *mem, u32 ttl) {
+bool us_memsinksh_has_clients(const us_memsink_shared_s *mem, u32 ttl) {
 	return (
 		mem->client_magic == US_MEMSINK_MAGIC
 		&& mem->last_client_ts + ttl > us_get_now_monotonic()
diff --git a/src/libs/memsinksh.h b/src/libs/memsinksh.h
index 9906c46..10a9659 100644
--- a/src/libs/memsinksh.h
+++ b/src/libs/memsinksh.h
@@ -57,4 +57,4 @@ int us_memsinksh_unmap(us_memsink_shared_s *mem, uz data_size);
 
 uz us_memsinksh_calculate_size(const char *obj);
 u8 *us_memsinksh_get_data(us_memsink_shared_s *mem);
-bool us_memsinksh_has_clients(us_memsink_shared_s *mem, u32 ttl);
+bool us_memsinksh_has_clients(const us_memsink_shared_s *mem, u32 ttl);