diff --git a/src/page.c b/src/page.c
index 9d919cfa..ba0d9a4d 100644
--- a/src/page.c
+++ b/src/page.c
@@ -274,7 +274,7 @@ static mi_page_t* mi_page_fresh(mi_heap_t* heap, mi_page_queue_t* pq) {
 void _mi_heap_delayed_free(mi_heap_t* heap) {
   // take over the list (note: no atomic exchange since it is often NULL)
   mi_block_t* block = mi_atomic_load_ptr_relaxed(mi_block_t, &heap->thread_delayed_free);
-  while (block != NULL && !mi_atomic_cas_ptr_weak_acq_rel(mi_block_t, &heap->thread_delayed_free, &block, NULL)) { /* nothing */ };
+  while (block != NULL && !mi_atomic_cas_ptr_weak_acq_rel(mi_block_t, &heap->thread_delayed_free, (void**)&block, NULL)) { /* nothing */ };
 
   // and free them all
   while(block != NULL) {
diff --git a/src/segment.c b/src/segment.c
index c9fb364e..74d3a46d 100644
--- a/src/segment.c
+++ b/src/segment.c
@@ -921,7 +921,7 @@ static bool mi_abandoned_visited_revisit(void)
   if (mi_atomic_load_ptr_relaxed(mi_segment_t, &abandoned_visited) == NULL) return false;
 
   // grab the whole visited list
-  mi_segment_t* first = mi_atomic_exchange_ptr_acq_rel(mi_segment_t, &abandoned_visited, NULL);
+  mi_segment_t* first = (mi_segment_t*)mi_atomic_exchange_ptr_acq_rel(mi_segment_t, &abandoned_visited, NULL);
   if (first == NULL) return false;
 
   // first try to swap directly if the abandoned list happens to be NULL