diff --git a/core/src/main/kotlin/com/r3corda/core/testing/Generators.kt b/core/src/main/kotlin/com/r3corda/core/testing/Generators.kt
index 20714593cb..cea99ce2eb 100644
--- a/core/src/main/kotlin/com/r3corda/core/testing/Generators.kt
+++ b/core/src/main/kotlin/com/r3corda/core/testing/Generators.kt
@@ -63,18 +63,21 @@ class StateRefGenerator: Generator<StateRef>(StateRef::class.java) {
     }
 }
 
+@Suppress("CAST_NEVER_SUCCEEDS")
 class TransactionStateGenerator<T : ContractState>(val stateGenerator: Generator<T>) : Generator<TransactionState<T>>(TransactionState::class.java as Class<TransactionState<T>>) {
     override fun generate(random: SourceOfRandomness, status: GenerationStatus): TransactionState<T> {
         return TransactionState(stateGenerator.generate(random, status), PartyGenerator().generate(random, status))
     }
 }
 
+@Suppress("CAST_NEVER_SUCCEEDS")
 class IssuedGenerator<T>(val productGenerator: Generator<T>) : Generator<Issued<T>>(Issued::class.java as Class<Issued<T>>) {
     override fun generate(random: SourceOfRandomness, status: GenerationStatus): Issued<T> {
         return Issued(PartyAndReferenceGenerator().generate(random, status), productGenerator.generate(random, status))
     }
 }
 
+@Suppress("CAST_NEVER_SUCCEEDS")
 class AmountGenerator<T>(val tokenGenerator: Generator<T>) : Generator<Amount<T>>(Amount::class.java as Class<Amount<T>>) {
     override fun generate(random: SourceOfRandomness, status: GenerationStatus): Amount<T> {
         return Amount(random.nextLong(0, 1000000), tokenGenerator.generate(random, status))