diff --git a/api-lib-core/src/main/java/de/ozgcloud/apilib/vorgang/grpc/OzgCloudVorgangQueryMapper.java b/api-lib-core/src/main/java/de/ozgcloud/apilib/vorgang/grpc/OzgCloudVorgangQueryMapper.java
index 41117bb6a4690c421d2d533d0ee5f89ef747ad2b..578097370e5d12950085a7a3aeb0b45f57154a56 100644
--- a/api-lib-core/src/main/java/de/ozgcloud/apilib/vorgang/grpc/OzgCloudVorgangQueryMapper.java
+++ b/api-lib-core/src/main/java/de/ozgcloud/apilib/vorgang/grpc/OzgCloudVorgangQueryMapper.java
@@ -64,7 +64,7 @@ public interface OzgCloudVorgangQueryMapper {
 				.build();
 	}
 
-	default Builder getEqualExpressionBuilder() {
+	private Builder getEqualExpressionBuilder() {
 		return GrpcVorgangQueryExpression.newBuilder()
 				.setOperator(GrpcQueryOperator.EQUAL);
 	}