diff --git a/organize/work/README.txt b/organize/work/README.txt
index ea01334..ce159da 100644
--- a/organize/work/README.txt
+++ b/organize/work/README.txt
@@ -236,7 +236,7 @@ The user interface is a ReportConceptView subclass that is directly associated w
     {'actions': [...]}
 
   >>> results.totals.data
-  {'effort': 900}
+  {'effort': 900.0}
 
 Export of work data
 -------------------
diff --git a/organize/work/report.py b/organize/work/report.py
index 52949cb..87e0e95 100644
--- a/organize/work/report.py
+++ b/organize/work/report.py
@@ -75,6 +75,7 @@ class DurationField(Field):
 
     def getValue(self, row):
         value = self.getRawValue(row) or 0
+        value = float(value)
         if value and 'totals' in self.executionSteps:
             data = row.parent.totals.data
             data[self.name] = data.get(self.name, 0) + value