diff --git a/config.py b/config.py
index 95e5524..2663650 100644
--- a/config.py
+++ b/config.py
@@ -12,6 +12,8 @@
 #
 # These functions will be run once per request, so make sure they are fast.
 #
+# If you need access to the environ use the `with_environ` decorator.
+#
 # Example:
 #   ...in appengine_config.py:
 #       def gae_mini_profiler_should_profile_production():
@@ -30,13 +32,26 @@ def _should_profile_development_default():
     Can be overridden in appengine_config.py"""
     return True
 
+def with_environ(func):
+    """Decorator to distinguish should_profile_*() methods that need access
+    to the environ"""
+    func._accept_environ = True
+    return func
+
 _config = lib_config.register("gae_mini_profiler", {
     "should_profile_production": _should_profile_production_default,
     "should_profile_development": _should_profile_development_default})
 
-def should_profile():
+def should_profile(environ):
     """Returns true if the current request should be profiles."""
     if util.dev_server:
-        return _config.should_profile_development()
+        func = _config.should_profile_development
     else:
-        return _config.should_profile_production()
+        func = _config.should_profile_production
+
+    if getattr(func, '_accept_environ', False):
+        args = environ,
+    else:
+        args = tuple()
+
+    return func(*args)
diff --git a/profiler.py b/profiler.py
index 3b6ef16..4baffad 100644
--- a/profiler.py
+++ b/profiler.py
@@ -584,7 +584,7 @@ def __call__(self, environ, start_response):
         CurrentRequestId.set(None)
 
         # Never profile calls to the profiler itself to avoid endless recursion.
-        if (not config.should_profile() or
+        if (not config.should_profile(environ) or
             environ.get("PATH_INFO", "").startswith("/gae_mini_profiler/")):
             result = self.app(environ, start_response)
             for value in result: