diff --git a/monai/auto3dseg/analyzer.py b/monai/auto3dseg/analyzer.py
index d5cfb21dab..56419da4cb 100644
--- a/monai/auto3dseg/analyzer.py
+++ b/monai/auto3dseg/analyzer.py
@@ -256,7 +256,7 @@ def __call__(self, data):
         )
 
         report[ImageStatsKeys.SIZEMM] = [
-            int(a * b) for a, b in zip(report[ImageStatsKeys.SHAPE][0], report[ImageStatsKeys.SPACING])
+            a * b for a, b in zip(report[ImageStatsKeys.SHAPE][0], report[ImageStatsKeys.SPACING])
         ]
 
         report[ImageStatsKeys.INTENSITY] = [