diff --git a/ms2/src/org/labkey/ms2/PeptideManager.java b/ms2/src/org/labkey/ms2/PeptideManager.java
index f3211271a..267584f50 100644
--- a/ms2/src/org/labkey/ms2/PeptideManager.java
+++ b/ms2/src/org/labkey/ms2/PeptideManager.java
@@ -347,7 +347,7 @@ public static SimpleFilter reduceToValidColumns(SimpleFilter fullFilter, TableIn
                                 {
                                     if (values[i] != null)
                                     {
-                                        values[i] = ConvertUtils.convert(values[i].toString(), column.getJavaClass());
+                                        values[i] = column.convert(values[i]);
                                     }
                                 }
                             }