diff --git a/jc/parsers/arp.py b/jc/parsers/arp.py
index 70b9898e..064c51a6 100644
--- a/jc/parsers/arp.py
+++ b/jc/parsers/arp.py
@@ -78,6 +78,7 @@ $ arp -a | jc --arp -p -r
   }
 ]
 """
+import jc
 
 
 def process(proc_data):
@@ -103,6 +104,8 @@ def process(proc_data):
 
 
 def parse(data, raw=False):
+    jc.jc.compatibility(__name__,
+                        ['linux'])
 
     # code adapted from Conor Heine at:
     # https://gist.github.com/cahna/43a1a3ff4d075bcd71f9d7120037a501
diff --git a/jc/parsers/df.py b/jc/parsers/df.py
index dfe28982..b05dc7b4 100644
--- a/jc/parsers/df.py
+++ b/jc/parsers/df.py
@@ -63,6 +63,7 @@ $ df | jc --df -p -r
   ...
 ]
 """
+import jc
 
 
 def process(proc_data):
@@ -106,6 +107,9 @@ def process(proc_data):
 
 
 def parse(data, raw=False):
+    jc.jc.compatibility(__name__,
+                        ['linux'])
+
     cleandata = data.splitlines()
     fix_headers = cleandata[0].lower().replace('avail ', 'available ')
     fix_headers = fix_headers.replace('use%', 'use_percent')
diff --git a/jc/parsers/ls.py b/jc/parsers/ls.py
index 5f3360e9..4469494d 100644
--- a/jc/parsers/ls.py
+++ b/jc/parsers/ls.py
@@ -135,6 +135,7 @@ $ ls -l /usr/bin | jc --ls | jq '.[] | select(.size > 50000000)'
 }
 """
 import re
+import jc
 
 
 def process(proc_data):
@@ -165,6 +166,9 @@ def process(proc_data):
 
 
 def parse(data, raw=False):
+    jc.jc.compatibility(__name__,
+                        ['linux', 'darwin'])
+
     raw_output = []
 
     linedata = data.splitlines()