diff --git a/core/src/main/kotlin/core/Structures.kt b/core/src/main/kotlin/core/Structures.kt
index 0ce94f7115..328243ae93 100644
--- a/core/src/main/kotlin/core/Structures.kt
+++ b/core/src/main/kotlin/core/Structures.kt
@@ -144,6 +144,7 @@ interface Contract {
      * rather than an argument so that additional data can be added without breaking binary compatibility with
      * existing contract code.
      */
+    @Throws(IllegalArgumentException::class)
     fun verify(tx: TransactionForVerification)
 
     /**