diff --git a/priorConditionedAnnealing/pca.py b/priorConditionedAnnealing/pca.py
index d928eae..f17c130 100644
--- a/priorConditionedAnnealing/pca.py
+++ b/priorConditionedAnnealing/pca.py
@@ -147,7 +147,7 @@ class PCA_Distribution(SB3_Distribution):
         assert self.skip_conditioning or type(traj) != type(None), 'A past trajectory has to be supplied if conditinoning is performed'
         pi_mean, pi_std = self.distribution.mean.cpu(), self.distribution.scale.cpu()
         rho_mean, rho_std = self._conditioning_engine(traj, pi_mean, pi_std)
-        rho_std *= f_sigma
+        rho_std = rho_std * f_sigma
         eta = self._get_rigged(pi_mean, pi_std,
                                rho_mean, rho_std,
                                epsilon)