diff --git a/src/amd/vulkan/radv_cmd_buffer.c b/src/amd/vulkan/radv_cmd_buffer.c
index ea558d53ce8..48b24258d81 100644
--- a/src/amd/vulkan/radv_cmd_buffer.c
+++ b/src/amd/vulkan/radv_cmd_buffer.c
@@ -12062,7 +12062,8 @@ radv_emit_msaa_state(struct radv_cmd_buffer *cmd_buffer)
              !uses_inner_coverage) {
             pa_sc_conservative_rast |= S_028C4C_OVER_RAST_ENABLE(1) |
                                        S_028C4C_UNDER_RAST_SAMPLE_SELECT(pdev->info.gfx_level < GFX12) |
-                                       S_028C4C_PBB_UNCERTAINTY_REGION_ENABLE(1);
+                                       S_028C4C_PBB_UNCERTAINTY_REGION_ENABLE(1) |
+                                       S_028C4C_ZMM_TRI_EXTENT(1);
          } else {
             pa_sc_conservative_rast |=
                S_028C4C_OVER_RAST_SAMPLE_SELECT(pdev->info.gfx_level < GFX12) | S_028C4C_UNDER_RAST_ENABLE(1);