diff --git a/src/gallium/winsys/radeon/drm/radeon_drm_bo.c b/src/gallium/winsys/radeon/drm/radeon_drm_bo.c
index 550886d14f8..027e9d3f47a 100644
--- a/src/gallium/winsys/radeon/drm/radeon_drm_bo.c
+++ b/src/gallium/winsys/radeon/drm/radeon_drm_bo.c
@@ -162,6 +162,7 @@ static void *radeon_bo_map_internal(struct pb_buffer *_buf,
 
     if (flags & PB_USAGE_DONTBLOCK) {
         if (radeon_bo_is_referenced_by_cs(cs, bo)) {
+            cs->flush_cs(cs->flush_data);
             return NULL;
         }