diff --git a/src/gallium/drivers/radeonsi/si_state.c b/src/gallium/drivers/radeonsi/si_state.c
index 8087d0a8c66..5cdad024694 100644
--- a/src/gallium/drivers/radeonsi/si_state.c
+++ b/src/gallium/drivers/radeonsi/si_state.c
@@ -5703,7 +5703,7 @@ static void si_init_config(struct si_context *sctx)
 		}
 
 		si_pm4_set_reg(pm4, R_028C48_PA_SC_BINNER_CNTL_1,
-			       S_028C48_MAX_ALLOC_COUNT(max_alloc_count) |
+			       S_028C48_MAX_ALLOC_COUNT(max_alloc_count - 1) |
 			       S_028C48_MAX_PRIM_PER_BATCH(1023));
 		si_pm4_set_reg(pm4, R_028C4C_PA_SC_CONSERVATIVE_RASTERIZATION_CNTL,
 			       S_028C4C_NULL_SQUAD_AA_MASK_ENABLE(1));