% ./simfactory/bin/sim whoami
Error: value for key ppn in section osx-homebrew is not of required type int
Aborting Simfactory.

diff --git a/lib/simdt.py b/lib/simdt.py
index 6b51053f..c1a63cea 100644
--- a/lib/simdt.py
+++ b/lib/simdt.py
@@ -528,7 +528,7 @@ class DecisionTree:
             # Throughout, we ignore hyperthreading.  That can be added later.
             if platform.system()== 'Darwin':
                 SocketsPerNode = int(cpu_info['hw.packages'])
-                CoresPerSocket = int(cpu_info['hw.physicalcpu']) / SocketsPerNode
+                CoresPerSocket = int(cpu_info['hw.physicalcpu']) // SocketsPerNode
             else:
                 CoresPerSocket = int(cpu_info['Core(s) per socket'])
                 SocketsPerNode = int(cpu_info['Socket(s)'])