diff --git a/pb.py b/pb.py
index 975dede..e21d588 100644
--- a/pb.py
+++ b/pb.py
@@ -461,6 +461,7 @@ def decode(buf, schema=None, _depth=0, _max_depth=_MAX_NESTING_DEPTH):
                 elif tt == "sfixed32":
                     v = v - 0x100000000 if v >= 0x80000000 else v
         else:
+            print(key, i, field, wt, spec, ns["fields"])
             raise ValueError("unsupported wire type {}".format(wt))
 
         out_key = (spec.get("name") if spec else field)