diff --git a/async_substrate_interface/sync_substrate.py b/async_substrate_interface/sync_substrate.py
index f6ff5b6..d393c25 100644
--- a/async_substrate_interface/sync_substrate.py
+++ b/async_substrate_interface/sync_substrate.py
@@ -764,9 +764,12 @@ def decode_scale(
             return ss58_encode(scale_bytes, self.ss58_format)
         else:
             if self.runtime.metadata_v15 is not None and force_legacy is False:
-                obj = decode_by_type_string(
-                    type_string, self.runtime.registry, scale_bytes
-                )
+                try:
+                    obj = decode_by_type_string(
+                        type_string, self.runtime.registry, scale_bytes
+                    )
+                except ValueError:
+                    obj = legacy_scale_decode(type_string, scale_bytes, self.runtime)
                 if self.decode_ss58:
                     try:
                         type_str_int = int(type_string.split("::")[1])