diff --git a/endpoints/common.py b/endpoints/common.py
index d8ff503fe..05f3bdb1e 100644
--- a/endpoints/common.py
+++ b/endpoints/common.py
@@ -94,7 +94,7 @@ def param_required(param_name, allow_body=False):
     @wraps(wrapped)
     def decorated(*args, **kwargs):
       if param_name not in request.args:
-        if not allow_body and param_name not in request.values:
+        if not allow_body or param_name not in request.values:
           abort(make_response('Required param: %s' % param_name, 400))
       return wrapped(*args, **kwargs)
     return decorated