diff --git a/scripts/pmt_rates.py b/scripts/pmt_rates.py
index 959db17cd8828fe57b2111d274f98408df5ef23d..883d7b4561656bd2aeed4ffcfd325c1009268813 100755
--- a/scripts/pmt_rates.py
+++ b/scripts/pmt_rates.py
@@ -90,7 +90,7 @@ class PMTRates(kp.Module):
 
     def add_column(self):
         m_rates = np.roll(self.rates_matrix, -1, 1)
-        m_hrv = np.roll(self.rates_matrix, -1, 1)
+        m_hrv = np.roll(self.hrv_matrix, -1, 1)
         y_range = 18 * 31
         mean_rates = np.full(y_range, np.nan)
         hrv = np.full(y_range, np.nan)