diff --git a/src/torchsurv/metrics/cindex.py b/src/torchsurv/metrics/cindex.py
index 9276a07..918058f 100644
--- a/src/torchsurv/metrics/cindex.py
+++ b/src/torchsurv/metrics/cindex.py
@@ -585,7 +585,7 @@ def _p_value_noether(self, alternative, null_value: float = 0.5) -> torch.tensor
         cindex_se = self._concordance_index_se()
 
         # get p-value
-        if cindex_se > 0:
+        if cindex_se >= 0:
             p = torch.distributions.normal.Normal(0, 1).cdf(
                 (self.cindex - null_value) / cindex_se
             )