diff --git a/src/arena.c b/src/arena.c
index 85d144e0..a61cb813 100644
--- a/src/arena.c
+++ b/src/arena.c
@@ -103,7 +103,7 @@ static bool mi_arena_has_page(mi_arena_t* arena, mi_page_t* page) {
 }
 #endif
 
-size_t mi_arena_min_alignment() {
+size_t mi_arena_min_alignment(void) {
   return MI_ARENA_SLICE_ALIGN;
 }