diff --git a/.travis.yml b/.travis.yml
index 5623640..4a1b8b5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,7 @@ python:
   - "3.5"
   - "3.6"
   - "3.7"
+  - "3.8"
 install:
 - pip install --upgrade pip wheel
 - pip install Cython
diff --git a/CHANGES.md b/CHANGES.md
index 6e2a900..bd04765 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,9 @@
 # Changes
 
+v1.1.24 (2019.11.27)
+
+* Fix #87 - Python 3.8 compatibility, time.clock removed
+
 v1.1.23 (2019.11.22)
 
 * Set minimum Python version to 3.4.5
diff --git a/atropos/util/__init__.py b/atropos/util/__init__.py
index 67f8813..d5d9bf3 100644
--- a/atropos/util/__init__.py
+++ b/atropos/util/__init__.py
@@ -248,7 +248,7 @@ def __sub__(self, other, minval=0.01):
         """
         return dict(
             wallclock=max(minval, self.timestamp() - other.timestamp()),
-            cpu=max(minval, self.process_time - other.clock))
+            cpu=max(minval, self.process_time - other.process_time))
 
 class Timing(Summarizable):
     """Context manager that maintains timing information using