diff --git a/invesalius/reader/dicom_reader.py b/invesalius/reader/dicom_reader.py
index d82622b..54e3d41 100644
--- a/invesalius/reader/dicom_reader.py
+++ b/invesalius/reader/dicom_reader.py
@@ -51,7 +51,9 @@ def SelectLargerDicomGroup(patient_group):
         group_list = patient.GetGroups()
         for group in group_list:
             if group.nslices > maxslices:
+                maxslices = group.nslices
                 larger_group = group
+    
     return larger_group
 
 def SortFiles(filelist, dicom):
--
libgit2 0.21.2