diff --git a/hibernate-core/src/main/java/org/hibernate/metamodel/mapping/EntityMappingType.java b/hibernate-core/src/main/java/org/hibernate/metamodel/mapping/EntityMappingType.java
index db305ff9c5..0dc6274529 100644
--- a/hibernate-core/src/main/java/org/hibernate/metamodel/mapping/EntityMappingType.java
+++ b/hibernate-core/src/main/java/org/hibernate/metamodel/mapping/EntityMappingType.java
@@ -104,6 +104,11 @@ public interface EntityMappingType
 		return getMappedJavaType();
 	}
 
+	@Override
+	default EntityMappingType asEntityMappingType() {
+		return this;
+	}
+
 	@Override
 	default MappingType getPartMappingType() {
 		return this;
diff --git a/hibernate-core/src/main/java/org/hibernate/metamodel/mapping/ModelPart.java b/hibernate-core/src/main/java/org/hibernate/metamodel/mapping/ModelPart.java
index a2ee291286..c10fa072d3 100644
--- a/hibernate-core/src/main/java/org/hibernate/metamodel/mapping/ModelPart.java
+++ b/hibernate-core/src/main/java/org/hibernate/metamodel/mapping/ModelPart.java
@@ -142,6 +142,10 @@ public interface ModelPart extends MappingModelExpressible {
 		return null;
 	}
 
+	default EntityMappingType asEntityMappingType(){
+		return null;
+	}
+
 	/**
 	 * A short hand form of {@link #breakDownJdbcValues(Object, int, Object, Object, JdbcValueBiConsumer, SharedSessionContractImplementor)},
 	 * that passes 0 as offset and null for the two values {@code X} and {@code Y}.
diff --git a/hibernate-core/src/main/java/org/hibernate/sql/results/graph/entity/AbstractEntityInitializer.java b/hibernate-core/src/main/java/org/hibernate/sql/results/graph/entity/AbstractEntityInitializer.java
index 913755bd7d..265166c2fc 100644
--- a/hibernate-core/src/main/java/org/hibernate/sql/results/graph/entity/AbstractEntityInitializer.java
+++ b/hibernate-core/src/main/java/org/hibernate/sql/results/graph/entity/AbstractEntityInitializer.java
@@ -172,7 +172,8 @@ public abstract class AbstractEntityInitializer extends AbstractFetchParentAcces
 					: fetch.createAssembler( this, creationState );
 
 			final int stateArrayPosition = attributeMapping.getStateArrayPosition();
-			final EntityMappingType declaringType = (EntityMappingType) attributeMapping.getDeclaringType();
+			final EntityMappingType declaringType = attributeMapping.getDeclaringType().asEntityMappingType();
+
 			assemblers[declaringType.getSubclassId()][stateArrayPosition] = stateAssembler;
 			for ( EntityMappingType subMappingType : declaringType.getSubMappingTypes() ) {
 				assemblers[subMappingType.getSubclassId()][stateArrayPosition] = stateAssembler;