diff --git a/core/src/main/kotlin/net/corda/core/internal/PlatformVersionSwitches.kt b/core/src/main/kotlin/net/corda/core/internal/PlatformVersionSwitches.kt
index 144b5b5821..8d24cb03d3 100644
--- a/core/src/main/kotlin/net/corda/core/internal/PlatformVersionSwitches.kt
+++ b/core/src/main/kotlin/net/corda/core/internal/PlatformVersionSwitches.kt
@@ -5,6 +5,5 @@ Constants for new features that can only be switched on at specific platform ver
 The text constant describes the feature and the numeric specifies the platform version the feature is enabled at.
  */
 object PlatformVersionSwitches {
-    const val REMOVE_NO_OVERLAP_RULE_FOR_REFERENCE_DATA_ATTACHMENTS = 7
     const val ENABLE_P2P_COMPRESSION = 7
 }
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