diff --git a/nssa/program_methods/guest/src/bin/token.rs b/nssa/program_methods/guest/src/bin/token.rs
index 5b1bc01..f7ee9cc 100644
--- a/nssa/program_methods/guest/src/bin/token.rs
+++ b/nssa/program_methods/guest/src/bin/token.rs
@@ -124,7 +124,7 @@ impl TokenDefinition {
             panic!("Invalid Token Definition data");
         }
 
-        Data::try_from(bytes).expect("Invalid data")
+        Data::try_from(bytes).expect("Token definition data size must fit into data")
     }
 
     fn parse(data: &Data) -> Option<Self> {