diff --git a/pysat/_instrument.py b/pysat/_instrument.py
index <HASH>..<HASH> 100644
--- a/pysat/_instrument.py
+++ b/pysat/_instrument.py
@@ -504,7 +504,7 @@ class Instrument(object):
         except AttributeError:
             pass
         try:
-            self.multi_file_day = inst.self.multi_file_day
+            self.multi_file_day = inst.multi_file_day
         except AttributeError:
             pass
         try:
multi_file_day bugfix

Fixed a bug where the instrument specified multi_file_day flag was not being set due to a typol