diff --git a/src/gallium/drivers/zink/zink_bo.c b/src/gallium/drivers/zink/zink_bo.c
index be67b2c1e3a..76b97565650 100644
--- a/src/gallium/drivers/zink/zink_bo.c
+++ b/src/gallium/drivers/zink/zink_bo.c
@@ -704,6 +704,7 @@ zink_bo_map(struct zink_screen *screen, struct zink_bo *bo)
       offset = bo->offset - real->offset;
    }
 
+   p_atomic_inc(&real->u.real.map_count);
    cpu = p_atomic_read(&real->u.real.cpu_ptr);
    if (!cpu) {
       simple_mtx_lock(&real->lock);
@@ -715,6 +716,7 @@ zink_bo_map(struct zink_screen *screen, struct zink_bo *bo)
          if (result != VK_SUCCESS) {
             mesa_loge("ZINK: vkMapMemory failed (%s)", vk_Result_to_str(result));
             simple_mtx_unlock(&real->lock);
+            p_atomic_dec(&real->u.real.map_count);
             return NULL;
          }
          if (unlikely(zink_debug & ZINK_DEBUG_MAP)) {
@@ -725,7 +727,6 @@ zink_bo_map(struct zink_screen *screen, struct zink_bo *bo)
       }
       simple_mtx_unlock(&real->lock);
    }
-   p_atomic_inc(&real->u.real.map_count);
 
    return (uint8_t*)cpu + offset;
 }
@@ -738,12 +739,14 @@ zink_bo_unmap(struct zink_screen *screen, struct zink_bo *bo)
    assert(real->u.real.map_count != 0 && "too many unmaps");
 
    if (p_atomic_dec_zero(&real->u.real.map_count)) {
+      simple_mtx_lock(&real->lock);
       p_atomic_set(&real->u.real.cpu_ptr, NULL);
       if (unlikely(zink_debug & ZINK_DEBUG_MAP)) {
          p_atomic_add(&screen->mapped_vram, -real->base.base.size);
          mesa_loge("UNMAP(%"PRIu64") TOTAL(%"PRIu64")", real->base.base.size, screen->mapped_vram);
       }
       VKSCR(UnmapMemory)(screen->dev, real->mem);
+      simple_mtx_unlock(&real->lock);
    }
 }