diff --git a/FluentFTP/Streams/FtpSocketStream.cs b/FluentFTP/Streams/FtpSocketStream.cs
index 53eebc106..a5fc71abe 100644
--- a/FluentFTP/Streams/FtpSocketStream.cs
+++ b/FluentFTP/Streams/FtpSocketStream.cs
@@ -869,7 +869,7 @@ private IPAddress[] GetCachedHostAddresses(string host) {
 #else
 				ipads = Dns.GetHostAddresses(host);
 #endif
-				Client.Status.CachedHostIpads.Add(host, ipads);
+				Client.Status.CachedHostIpads[host] = ipads;
 			}
 
 			return ipads;
@@ -1019,7 +1019,7 @@ private async Task<IPAddress[]> GetCachedHostAddressesAsync(string host, Cancell
 #else
 				ipads = await Dns.GetHostAddressesAsync(host);
 #endif
-				Client.Status.CachedHostIpads.Add(host, ipads);
+				Client.Status.CachedHostIpads[host] = ipads;
 			}
 
 			return ipads;