diff --git a/src/main/kotlin/com/ecwid/apiclient/v3/dto/customer/request/UpdatedCustomer.kt b/src/main/kotlin/com/ecwid/apiclient/v3/dto/customer/request/UpdatedCustomer.kt
index b074b1f9..64192c50 100644
--- a/src/main/kotlin/com/ecwid/apiclient/v3/dto/customer/request/UpdatedCustomer.kt
+++ b/src/main/kotlin/com/ecwid/apiclient/v3/dto/customer/request/UpdatedCustomer.kt
@@ -21,6 +21,7 @@ data class UpdatedCustomer(
 	val lang: String? = null,
 	val privateAdminNotes: String? = null,
 	val extrafields: List<CustomerExtrafield>? = null,
+	val primaryPhone: String? = null,
 
 	@JsonFieldName("b2b_b2c")
 	val commercialRelationshipScheme: CommercialRelationshipScheme? = null,
diff --git a/src/test/kotlin/com/ecwid/apiclient/v3/rule/NonDuplicablePropertyRules.kt b/src/test/kotlin/com/ecwid/apiclient/v3/rule/NonDuplicablePropertyRules.kt
index 550ad38b..10ac6eed 100644
--- a/src/test/kotlin/com/ecwid/apiclient/v3/rule/NonDuplicablePropertyRules.kt
+++ b/src/test/kotlin/com/ecwid/apiclient/v3/rule/NonDuplicablePropertyRules.kt
@@ -19,6 +19,7 @@ val nonDuplicablePropertyRules: List<NonDuplicablePropertyRule<*, *>> = listOf(
 	WriteOnly(UpdatedVariation.AttributeValue::alias),
 	WriteOnly(UpdatedVariation.AttributeValue::name),
 	WriteOnly(UpdatedProduct.RelatedProducts::productSkus),
+	WriteOnly(UpdatedCustomer::primaryPhone), // contact becomes impossible to delete - rest4j replaces null with current value on writes
 
 )