diff --git a/drivers/gpu/nvgpu/gk20a/cde_gk20a.c b/drivers/gpu/nvgpu/gk20a/cde_gk20a.c
index 57707f542..24e2a778a 100644
--- a/drivers/gpu/nvgpu/gk20a/cde_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/cde_gk20a.c
@@ -795,7 +795,7 @@ int gk20a_cde_load(struct gk20a_cde_ctx *cde_ctx)
 	/* map backing store to gpu virtual space */
 	vaddr = gk20a_gmmu_map(ch->vm, &gr->compbit_store.sgt,
 			       g->gr.compbit_store.size, 0,
-			       gk20a_mem_flag_none);
+			       gk20a_mem_flag_read_only);
 
 	if (!vaddr) {
 		gk20a_warn(&cde_ctx->pdev->dev, "cde: cannot map compression bit backing store");