diff --git a/playground/amber/coords_io.py b/playground/amber/coords_io.py
index c09b902f..d8b11b66 100644
--- a/playground/amber/coords_io.py
+++ b/playground/amber/coords_io.py
@@ -17,7 +17,7 @@ def write_inpcrd(coords, inpcrd_filename, name=None):
         # Print OS-specific newline character.
         inpcrd_file.write(os.linesep)
         # Print the number of atoms.
-        inpcrd_file.write('{:> 5d}'.format(len(coords) / 3))
+        inpcrd_file.write('{:5d}'.format(len(coords) / 3))
         inpcrd_file.write(os.linesep)
         # Now loop through coords.
         for index in range(0, len(coords), 6):
@@ -36,4 +36,4 @@ def write_inpcrd(coords, inpcrd_filename, name=None):
     write_inpcrd(coords, 'my_test_file_15', '5_ATOMS')
     # Test with even number of atoms
     coords = np.random.random(18) - 0.5
-    write_inpcrd(coords, 'my_test_file_18', '6_ATOMS')
\ No newline at end of file
+    write_inpcrd(coords, 'my_test_file_18', '6_ATOMS')