diff --git a/src/gallium/drivers/lima/ir/gp/reduce_scheduler.c b/src/gallium/drivers/lima/ir/gp/reduce_scheduler.c
index bcfe6fd89b0..d0d341e5054 100644
--- a/src/gallium/drivers/lima/ir/gp/reduce_scheduler.c
+++ b/src/gallium/drivers/lima/ir/gp/reduce_scheduler.c
@@ -54,7 +54,9 @@ static void schedule_calc_sched_info(gpir_node *node)
       if (node->rsched.est < est)
          node->rsched.est = est;
 
-      float reg_weight = 1.0f - 1.0f / list_length(&pred->succ_list);
+      unsigned len = list_length(&pred->succ_list);
+      assert(len > 0);
+      float reg_weight = 1.0f - 1.0f / len;
       if (extra_reg > reg_weight)
          extra_reg = reg_weight;