diff --git a/Packages/PyLOOS/NAMDBin.py b/Packages/PyLOOS/NAMDBin.py
index 23cefcbb0..69b16d0b3 100644
--- a/Packages/PyLOOS/NAMDBin.py
+++ b/Packages/PyLOOS/NAMDBin.py
@@ -44,7 +44,7 @@ def readVals(self, velocities = False):
             num_atoms_model = len(self.atomicGroup)
             if num_atoms_big == num_atoms_model:
                 self.endian_signal = ">"
-            elif num_atoms_lttle == num_atoms_model:
+            elif num_atoms_little == num_atoms_model:
                 self.endian_signal = "<"
             else:
                 raise ValueError, "Number of atoms doesn't match supplied model"