diff --git a/iapws/iapws97.py b/iapws/iapws97.py
index <HASH>..<HASH> 100644
--- a/iapws/iapws97.py
+++ b/iapws/iapws97.py
@@ -4021,7 +4021,7 @@ def _Bound_hs(h, s):
     """
     region = None
     s13 = _Region1(623.15, 100)["s"]
-    s13s = _Region1(623.15,  Ps_623)["s"]
+    s13s = _Region1(623.15, Ps_623)["s"]
     sTPmax = _Region2(1073.15, 100)["s"]
     s2ab = _Region2(1073.15, 4)["s"]
Correct flake8 E<I> complaint.

E<I> multiple spaces after ','