diff --git a/include/mimalloc/atomic.h b/include/mimalloc/atomic.h
index c4fac766..5725bfbf 100644
--- a/include/mimalloc/atomic.h
+++ b/include/mimalloc/atomic.h
@@ -72,6 +72,7 @@ terms of the MIT license. A copy of the license can be found in the file
 #define mi_atomic_load_relaxed(p)                mi_atomic(load_explicit)(p,mi_memory_order(relaxed))
 #define mi_atomic_store_release(p,x)             mi_atomic(store_explicit)(p,x,mi_memory_order(release))
 #define mi_atomic_store_relaxed(p,x)             mi_atomic(store_explicit)(p,x,mi_memory_order(relaxed))
+#define mi_atomic_exchange_relaxed(p,x)          mi_atomic(exchange_explicit)(p,x,mi_memory_order(relaxed))
 #define mi_atomic_exchange_release(p,x)          mi_atomic(exchange_explicit)(p,x,mi_memory_order(release))
 #define mi_atomic_exchange_acq_rel(p,x)          mi_atomic(exchange_explicit)(p,x,mi_memory_order(acq_rel))
 #define mi_atomic_cas_weak_release(p,exp,des)    mi_atomic_cas_weak(p,exp,des,mi_memory_order(release),mi_memory_order(relaxed))
@@ -110,6 +111,7 @@ static inline intptr_t mi_atomic_subi(_Atomic(intptr_t)*p, intptr_t sub);
 #define mi_atomic_cas_ptr_weak_release(tp,p,exp,des)    mi_atomic_cas_weak_release(p,exp,(tp*)des)
 #define mi_atomic_cas_ptr_weak_acq_rel(tp,p,exp,des)    mi_atomic_cas_weak_acq_rel(p,exp,(tp*)des)
 #define mi_atomic_cas_ptr_strong_release(tp,p,exp,des)  mi_atomic_cas_strong_release(p,exp,(tp*)des)
+#define mi_atomic_exchange_ptr_relaxed(tp,p,x)          mi_atomic_exchange_relaxed(p,(tp*)x)
 #define mi_atomic_exchange_ptr_release(tp,p,x)          mi_atomic_exchange_release(p,(tp*)x)
 #define mi_atomic_exchange_ptr_acq_rel(tp,p,x)          mi_atomic_exchange_acq_rel(p,(tp*)x)
 #else
@@ -118,6 +120,7 @@ static inline intptr_t mi_atomic_subi(_Atomic(intptr_t)*p, intptr_t sub);
 #define mi_atomic_cas_ptr_weak_release(tp,p,exp,des)    mi_atomic_cas_weak_release(p,exp,des)
 #define mi_atomic_cas_ptr_weak_acq_rel(tp,p,exp,des)    mi_atomic_cas_weak_acq_rel(p,exp,des)
 #define mi_atomic_cas_ptr_strong_release(tp,p,exp,des)  mi_atomic_cas_strong_release(p,exp,des)
+#define mi_atomic_exchange_ptr_relaxed(tp,p,x)          mi_atomic_exchange_relaxed(p,x)
 #define mi_atomic_exchange_ptr_release(tp,p,x)          mi_atomic_exchange_release(p,x)
 #define mi_atomic_exchange_ptr_acq_rel(tp,p,x)          mi_atomic_exchange_acq_rel(p,x)
 #endif
diff --git a/include/mimalloc/internal.h b/include/mimalloc/internal.h
index 6f6e9dc3..0ede8f8c 100644
--- a/include/mimalloc/internal.h
+++ b/include/mimalloc/internal.h
@@ -167,7 +167,7 @@ void          _mi_arena_field_cursor_done(mi_arena_field_cursor_t* current);
 // "segment-map.c"
 void        _mi_segment_map_allocated_at(const mi_segment_t* segment);
 void        _mi_segment_map_freed_at(const mi_segment_t* segment);
-void        _mi_segment_map_destroy(void);
+void        _mi_segment_map_unsafe_destroy(void);
 
 // "segment.c"
 mi_page_t*  _mi_segment_page_alloc(mi_heap_t* heap, size_t block_size, size_t page_alignment, mi_segments_tld_t* tld);
diff --git a/src/init.c b/src/init.c
index ab99a8f8..b8c01e51 100644
--- a/src/init.c
+++ b/src/init.c
@@ -682,7 +682,7 @@ void mi_cdecl _mi_process_done(void) {
     mi_collect(true /* force */);
     _mi_heap_unsafe_destroy_all();     // forcefully release all memory held by all heaps (of this thread only!)
     _mi_arena_unsafe_destroy_all();
-    _mi_segment_map_destroy();
+    _mi_segment_map_unsafe_destroy();
   }
 
   if (mi_option_is_enabled(mi_option_show_stats) || mi_option_is_enabled(mi_option_verbose)) {
diff --git a/src/segment-map.c b/src/segment-map.c
index f6dff96d..ce754e98 100644
--- a/src/segment-map.c
+++ b/src/segment-map.c
@@ -126,9 +126,9 @@ mi_decl_nodiscard mi_decl_export bool mi_is_in_heap_region(const void* p) mi_att
   return mi_is_valid_pointer(p);
 }
 
-void _mi_segment_map_destroy(void) {
+void _mi_segment_map_unsafe_destroy(void) {
   for (size_t i = 0; i < MI_SEGMENT_MAP_MAX_PARTS; i++) {
-    mi_segmap_part_t* part = mi_segment_map[i];
+    mi_segmap_part_t* part = mi_atomic_exchange_ptr_relaxed(mi_segmap_part_t, &mi_segment_map[i], NULL);
     if (part != NULL) {
       _mi_os_free(part, sizeof(mi_segmap_part_t), part->memid);
     }