diff --git a/src/gallium/drivers/radeonsi/si_state_shaders.c b/src/gallium/drivers/radeonsi/si_state_shaders.c
index 8ec0470..b94d824 100644
--- a/src/gallium/drivers/radeonsi/si_state_shaders.c
+++ b/src/gallium/drivers/radeonsi/si_state_shaders.c
@@ -1824,7 +1824,7 @@ static void si_init_tess_factor_ring(struct si_context *sctx)
 		si_pm4_set_reg(sctx->init_config, R_030940_VGT_TF_MEMORY_BASE,
 			       r600_resource(sctx->tf_ring)->gpu_address >> 8);
 		si_pm4_set_reg(sctx->init_config, R_03093C_VGT_HS_OFFCHIP_PARAM,
-		             S_03093C_OFFCHIP_BUFFERING(offchip_blocks - 1) |
+		             S_03093C_OFFCHIP_BUFFERING(offchip_blocks) |
 		             S_03093C_OFFCHIP_GRANULARITY(V_03093C_X_8K_DWORDS));
 	} else {
 		si_pm4_set_reg(sctx->init_config, R_008988_VGT_TF_RING_SIZE,