diff --git a/include/mimalloc.h b/include/mimalloc.h
index bd91db43..9ab73c2a 100644
--- a/include/mimalloc.h
+++ b/include/mimalloc.h
@@ -277,7 +277,7 @@ mi_decl_export int mi_reserve_huge_os_pages_at(size_t pages, int numa_node, size
 mi_decl_export int  mi_reserve_os_memory(size_t size, bool commit, bool allow_large) mi_attr_noexcept;
 mi_decl_export bool mi_manage_os_memory(void* start, size_t size, bool is_committed, bool is_large, bool is_zero, int numa_node) mi_attr_noexcept;
 
-mi_decl_export void mi_debug_show_arenas(bool show_inuse) mi_attr_noexcept;
+mi_decl_export void mi_debug_show_arenas(void) mi_attr_noexcept;
 
 // Experimental: heaps associated with specific memory arena's
 typedef int mi_arena_id_t;
diff --git a/src/arena.c b/src/arena.c
index a809b85f..bc8d7c65 100644
--- a/src/arena.c
+++ b/src/arena.c
@@ -927,7 +927,8 @@ static size_t mi_debug_show_bitmap(const char* prefix, const char* header, size_
   return inuse_count;
 }
 
-void mi_debug_show_arenas(bool show_inuse) mi_attr_noexcept {
+void mi_debug_show_arenas(void) mi_attr_noexcept {
+  const bool show_inuse = true;
   size_t max_arenas = mi_atomic_load_relaxed(&mi_arena_count);
   size_t inuse_total = 0;
   //size_t abandoned_total = 0;
diff --git a/test/test-stress.c b/test/test-stress.c
index c0d9761a..eb788b85 100644
--- a/test/test-stress.c
+++ b/test/test-stress.c
@@ -322,7 +322,7 @@ int main(int argc, char** argv) {
 
 #ifndef USE_STD_MALLOC
   #ifndef NDEBUG
-  mi_debug_show_arenas(true);
+  mi_debug_show_arenas();
   mi_collect(true);
   #endif  
 #endif