diff --git a/lib/galaxy/datatypes/binary.py b/lib/galaxy/datatypes/binary.py
index 0a0bbbf3229..57b1f5223ab 100644
--- a/lib/galaxy/datatypes/binary.py
+++ b/lib/galaxy/datatypes/binary.py
@@ -474,7 +474,7 @@ class Bam( Binary ):
             ck_data = ""
             header_line_count = 0
             if offset == 0:
-                ck_data = bamfile.text.replace('\t',' ')
+                ck_data = bamfile.text.replace('\t', ' ')
                 header_line_count = bamfile.text.count('\n')
             else:
                 bamfile.seek( offset )