diff --git a/tests/policy.py b/tests/policy.py
index a0ddb90..4bc9c91 100644
--- a/tests/policy.py
+++ b/tests/policy.py
@@ -2,6 +2,7 @@
 import re
 import os
 import sys
+import platform
 
 ###
 # Check whether the regex will match a file path starting with the provided
@@ -252,12 +253,13 @@
 
     # load ctypes-ified libsepol wrapper
     def __InitLibsepolwrap(self, LibPath):
-        if "linux" in sys.platform:
+        if "linux" in platform.system().lower():
             lib = CDLL(LibPath + "/libsepolwrap.so")
-        elif "darwin" in sys.platform:
+        elif "darwin" in platform.system().lower():
             lib = CDLL(LibPath + "/libsepolwrap.dylib")
         else:
-            sys.exit("only Linux and Mac currrently supported")
+            sys.exit("policy.py: " + platform.system() + " not supported." +
+                    " Only Linux and Darwin platforms are currently supported.")
 
         # int get_allow_rule(char *out, size_t len, void *policydbp, void *avtab_iterp);
         lib.get_allow_rule.restype = c_int