diff --git a/hibernate-core/src/main/java/org/hibernate/mapping/PersistentClass.java b/hibernate-core/src/main/java/org/hibernate/mapping/PersistentClass.java
index 64ce21a05b..e4c89e0fe0 100644
--- a/hibernate-core/src/main/java/org/hibernate/mapping/PersistentClass.java
+++ b/hibernate-core/src/main/java/org/hibernate/mapping/PersistentClass.java
@@ -1103,7 +1103,9 @@ public abstract class PersistentClass implements IdentifiableTypeClass, Attribut
 			//and checked later, so it needs to be excluded
 			checkColumnDuplication( cols, getKey() );
 		}
-		checkColumnDuplication( cols, getDiscriminator() );
+		if ( isDiscriminatorInsertable() ) {
+			checkColumnDuplication( cols, getDiscriminator() );
+		}
 		checkPropertyColumnDuplication( cols, getNonDuplicatedProperties() );
 		for ( Join join : getJoins() ) {
 			cols.clear();