diff --git a/core/src/main/kotlin/net/corda/core/internal/InternalUtils.kt b/core/src/main/kotlin/net/corda/core/internal/InternalUtils.kt
index 3996dee1de..5f26ef2e48 100644
--- a/core/src/main/kotlin/net/corda/core/internal/InternalUtils.kt
+++ b/core/src/main/kotlin/net/corda/core/internal/InternalUtils.kt
@@ -1,3 +1,5 @@
+@file:JvmName("InternalUtils")
+
 package net.corda.core.internal
 
 import net.corda.core.crypto.SecureHash
diff --git a/core/src/main/kotlin/net/corda/core/serialization/SerializationAPI.kt b/core/src/main/kotlin/net/corda/core/serialization/SerializationAPI.kt
index f77e3ae122..0eccaf6ffb 100644
--- a/core/src/main/kotlin/net/corda/core/serialization/SerializationAPI.kt
+++ b/core/src/main/kotlin/net/corda/core/serialization/SerializationAPI.kt
@@ -1,3 +1,5 @@
+@file:JvmName("SerializationAPI")
+
 package net.corda.core.serialization
 
 import net.corda.core.crypto.SecureHash
diff --git a/core/src/main/kotlin/net/corda/core/utilities/KotlinUtils.kt b/core/src/main/kotlin/net/corda/core/utilities/KotlinUtils.kt
index b12ea8353d..897ae4d1d8 100644
--- a/core/src/main/kotlin/net/corda/core/utilities/KotlinUtils.kt
+++ b/core/src/main/kotlin/net/corda/core/utilities/KotlinUtils.kt
@@ -1,3 +1,5 @@
+@file:JvmName("KotlinUtils")
+
 package net.corda.core.utilities
 
 import net.corda.core.internal.concurrent.get