diff --git a/lib/api/lib.api b/lib/api/lib.api
index eea2884..891530a 100644
--- a/lib/api/lib.api
+++ b/lib/api/lib.api
@@ -11,12 +11,10 @@ public final class app/cash/kfsm/InvalidStateMachine : java/lang/Exception {
 
 public final class app/cash/kfsm/InvalidStateTransition : java/lang/Exception {
 	public fun <init> (Lapp/cash/kfsm/Transition;Lapp/cash/kfsm/Value;)V
-	public final fun component1 ()Lapp/cash/kfsm/Transition;
 	public final fun component2 ()Lapp/cash/kfsm/Value;
 	public final fun copy (Lapp/cash/kfsm/Transition;Lapp/cash/kfsm/Value;)Lapp/cash/kfsm/InvalidStateTransition;
 	public static synthetic fun copy$default (Lapp/cash/kfsm/InvalidStateTransition;Lapp/cash/kfsm/Transition;Lapp/cash/kfsm/Value;ILjava/lang/Object;)Lapp/cash/kfsm/InvalidStateTransition;
 	public fun equals (Ljava/lang/Object;)Z
-	public final fun getTransition ()Lapp/cash/kfsm/Transition;
 	public final fun getValue ()Lapp/cash/kfsm/Value;
 	public fun hashCode ()I
 	public fun toString ()Ljava/lang/String;
diff --git a/lib/src/main/kotlin/app/cash/kfsm/InvalidStateTransition.kt b/lib/src/main/kotlin/app/cash/kfsm/InvalidStateTransition.kt
index f489a79..9fcbad2 100644
--- a/lib/src/main/kotlin/app/cash/kfsm/InvalidStateTransition.kt
+++ b/lib/src/main/kotlin/app/cash/kfsm/InvalidStateTransition.kt
@@ -1,6 +1,6 @@
 package app.cash.kfsm
 
-data class InvalidStateTransition(val transition: Transition<*, *>, val value: Value<*, *>) : Exception(
+data class InvalidStateTransition(private val transition: Transition<*, *>, val value: Value<*, *>) : Exception(
   "Value cannot transition ${
     transition.from.set.toList().sortedBy { it.toString() }.joinToString(", ", prefix = "{", postfix = "}")
   } to ${transition.to}, because it is currently ${value.state}. [value=$value]"