diff --git a/jc/parsers/ps.py b/jc/parsers/ps.py
index 8c853769..21878d75 100644
--- a/jc/parsers/ps.py
+++ b/jc/parsers/ps.py
@@ -67,6 +67,7 @@ $ ps -ef | jc --ps -p
 """
 import jc.utils
 
+
 def process(proc_data):
     '''schema:
     [
@@ -82,6 +83,16 @@ def process(proc_data):
       }
     ]
     '''
+    for entry in proc_data:
+        int_list = ['pid', 'ppid', 'c']
+        for key in int_list:
+            if key in entry:
+                try:
+                    key_int = int(entry[key])
+                    entry[key] = key_int
+                except (ValueError):
+                    entry[key] = None
+
     return proc_data