diff --git a/VkNet/Abstractions/Category/Async/IMessagesCategoryAsync.cs b/VkNet/Abstractions/Category/Async/IMessagesCategoryAsync.cs
index d7834eb24..f09771ced 100644
--- a/VkNet/Abstractions/Category/Async/IMessagesCategoryAsync.cs
+++ b/VkNet/Abstractions/Category/Async/IMessagesCategoryAsync.cs
@@ -783,7 +783,7 @@ Task<ConversationResult> GetConversationsByIdAsync(IEnumerable<long> peerIds, IE
 		/// Страница документации ВКонтакте
 		/// http://vk.com/dev/messages.getConversationMembers
 		/// </remarks>
-		Task<GetConversationMembersResult> GetConversationMembersAsync(long peerId, IEnumerable<string> fields, ulong? groupId = null);
+		Task<GetConversationMembersResult> GetConversationMembersAsync(long peerId, IEnumerable<string> fields = null, ulong? groupId = null);
 
 		/// <summary>
 		/// Возвращает сообщения по их идентификаторам в рамках беседы.
@@ -1114,4 +1114,4 @@ Task<GetRecentCallsResult> GetRecentCallsAsync(IEnumerable<string> fields, ulong
 
 	#endregion
 	}
-}
\ No newline at end of file
+}
diff --git a/VkNet/Abstractions/Category/IMessagesCategory.cs b/VkNet/Abstractions/Category/IMessagesCategory.cs
index 12e1adf33..f8666ab98 100644
--- a/VkNet/Abstractions/Category/IMessagesCategory.cs
+++ b/VkNet/Abstractions/Category/IMessagesCategory.cs
@@ -122,7 +122,7 @@ ConversationResult GetConversationsById(IEnumerable<long> peerIds, IEnumerable<s
 		GetConversationsResult GetConversations(GetConversationsParams getConversationsParams);
 
 		/// <inheritdoc cref="IMessagesCategoryAsync.GetConversationMembersAsync"/>
-		GetConversationMembersResult GetConversationMembers(long peerId, IEnumerable<string> fields, ulong? groupId = null);
+		GetConversationMembersResult GetConversationMembers(long peerId, IEnumerable<string> fields = null, ulong? groupId = null);
 
 		/// <inheritdoc cref="IMessagesCategoryAsync.GetByConversationMessageIdAsync"/>
 		GetByConversationMessageIdResult GetByConversationMessageId(long peerId, [NotNull] IEnumerable<ulong> conversationMessageIds,
@@ -178,4 +178,4 @@ GetRecentCallsResult GetRecentCalls(IEnumerable<string> fields, ulong? count = n
 
 	#endregion
 	}
-}
\ No newline at end of file
+}
diff --git a/VkNet/Categories/Async/MessagesCategoryAsync.cs b/VkNet/Categories/Async/MessagesCategoryAsync.cs
index 5f36ff74b..75ab59ab1 100644
--- a/VkNet/Categories/Async/MessagesCategoryAsync.cs
+++ b/VkNet/Categories/Async/MessagesCategoryAsync.cs
@@ -82,7 +82,7 @@ public Task<GetConversationsResult> GetConversationsAsync(GetConversationsParams
 		}
 
 		/// <inheritdoc />
-		public Task<GetConversationMembersResult> GetConversationMembersAsync(long peerId, IEnumerable<string> fields,
+		public Task<GetConversationMembersResult> GetConversationMembersAsync(long peerId, IEnumerable<string> fields = null,
 																			ulong? groupId = null)
 		{
 			return TypeHelper.TryInvokeMethodAsync(() => GetConversationMembers(peerId, fields, groupId));
@@ -332,4 +332,4 @@ public Task<bool> EditAsync(MessageEditParams @params)
 			return TypeHelper.TryInvokeMethodAsync(() => Edit(@params));
 		}
 	}
-}
\ No newline at end of file
+}
diff --git a/VkNet/Categories/MessagesCategory.cs b/VkNet/Categories/MessagesCategory.cs
index ab43a733d..42bfe6f47 100644
--- a/VkNet/Categories/MessagesCategory.cs
+++ b/VkNet/Categories/MessagesCategory.cs
@@ -273,7 +273,7 @@ public GetConversationsResult GetConversations(GetConversationsParams getConvers
 		}
 
 		/// <inheritdoc />
-		public GetConversationMembersResult GetConversationMembers(long peerId, IEnumerable<string> fields, ulong? groupId = null)
+		public GetConversationMembersResult GetConversationMembers(long peerId, IEnumerable<string> fields = null, ulong? groupId = null)
 		{
 			return _vk.Call<GetConversationMembersResult>("messages.getConversationMembers",
 				new VkParameters
@@ -850,4 +850,4 @@ public Message GetById(ulong messageId, uint? previewLength = null)
 			throw new VkApiException("Сообщения с таким ID не существует.");
 		}
 	}
-}
\ No newline at end of file
+}