diff --git a/alpharaw/viz/df_utils.py b/alpharaw/viz/df_utils.py
index 8716642..8c1ff91 100644
--- a/alpharaw/viz/df_utils.py
+++ b/alpharaw/viz/df_utils.py
@@ -8,7 +8,7 @@
 from alphabase.peptide.fragment import create_fragment_mz_dataframe, flatten_fragments
 from alphabase.peptide.precursor import (
     calc_precursor_isotope_intensity,
-    calc_precursor_mz,
+    update_precursor_mz,
 )
 
 from alpharaw.match.match_utils import match_closest_peaks, match_highest_peaks