diff --git a/CHANGES b/CHANGES
index 6fc89148..5d23ae39 100644
--- a/CHANGES
+++ b/CHANGES
@@ -13,6 +13,8 @@ Fixes
 
 * restrict alchemlyb to <0.5.0 for Python 2 (otherwise the installation fails
   due to an unsatisfiable pandas dependency) (#180)
+* fix failure of mdpow-solvation script "AttributeError: 'AttributeDict' object
+  has no attribute 'Gibbs'" (#180)
 
 
 2021-08-02    0.7.0
diff --git a/mdpow/fep.py b/mdpow/fep.py
index 00e37627..f001b939 100644
--- a/mdpow/fep.py
+++ b/mdpow/fep.py
@@ -1400,7 +1400,7 @@ def p_transfer(G1, G2, **kwargs):
                 logger.error(errmsg)
                 raise ValueError(errmsg)
 
-        if kwargs['force'] or (not hasattr(G.results.DeltaA, 'Gibbs')):
+        if kwargs['force'] or 'Gibbs' not in G.results.DeltaA:
             # write out the settings when the analysis is performed
             logger.info("The solvent is %s .", G.solvent_type)
             logger.info("Estimator is %s.", estimator)
diff --git a/scripts/mdpow-solvationenergy b/scripts/mdpow-solvationenergy
index d06d9a60..59fefb55 100755
--- a/scripts/mdpow-solvationenergy
+++ b/scripts/mdpow-solvationenergy
@@ -132,7 +132,7 @@ def run_gsolv(solvent, directory, **kwargs):
         kwargs.setdefault('SI', gsolv.SI)
 
     # make sure that we have data
-    if kwargs['force'] or (not hasattr(gsolv.results.DeltaA, 'Gibbs')):
+    if kwargs['force'] or 'Gibbs' not in gsolv.results.DeltaA:
         logger.info("[%(directory)s] Forcing (re)analysis of hydration free energy data", vars())
         # write out the settings when the analysis is performed
         logger.info("Estimator is %s.", estimator)