diff --git a/deepdog/direct_monte_carlo/direct_mc.py b/deepdog/direct_monte_carlo/direct_mc.py
index 50ada69..f77a0f4 100644
--- a/deepdog/direct_monte_carlo/direct_mc.py
+++ b/deepdog/direct_monte_carlo/direct_mc.py
@@ -14,6 +14,8 @@ import multiprocessing
 
 _logger = logging.getLogger(__name__)
 
+ANTI_ZERO_SUCCESS_THRES = 0.1
+
 
 @dataclass
 class DirectMonteCarloResult:
@@ -292,7 +294,11 @@ class DirectMonteCarloRun:
 			num_models = len(self.model_name_pairs)
 			success_weight = sum(
 				[
-					(res.successes / res.monte_carlo_count) / num_models
+					(
+						max(ANTI_ZERO_SUCCESS_THRES, res.successes)
+						/ res.monte_carlo_count
+					)
+					/ num_models
 					for res in results
 				]
 			)
@@ -303,7 +309,8 @@ class DirectMonteCarloRun:
 						f"{res.model_name}_success": res.successes,
 						f"{res.model_name}_count": res.monte_carlo_count,
 						f"{res.model_name}_prob": (
-							res.successes / res.monte_carlo_count
+							max(ANTI_ZERO_SUCCESS_THRES, res.successes)
+							/ res.monte_carlo_count
 						)
 						/ (num_models * success_weight),
 					}