diff --git a/slime/rollout/rm_hub/deepscaler.py b/slime/rollout/rm_hub/deepscaler.py
index 39d4de383a..014f0677de 100644
--- a/slime/rollout/rm_hub/deepscaler.py
+++ b/slime/rollout/rm_hub/deepscaler.py
@@ -7,7 +7,10 @@ def get_deepscaler_rule_based_reward(response, label):
     elif "###Response" in response:
         model_solution = response.split("###Response")[1]
     else:
-        return 0
+        # Non-thinking models emit neither marker; grade the whole response
+        # instead of silently returning 0 (which zeroes every reward and
+        # kills the GRPO signal without any visible error).
+        model_solution = response
 
     model_answer = extract_answer(model_solution)
     if model_answer is None: