diff --git a/ArchiSteamFarm/ASF.cs b/ArchiSteamFarm/ASF.cs
index 58175a9a3..c55532ba4 100644
--- a/ArchiSteamFarm/ASF.cs
+++ b/ArchiSteamFarm/ASF.cs
@@ -142,7 +142,7 @@ namespace ArchiSteamFarm {
 
 			GlobalConfig = globalConfig;
 
-			string webProxyText = !string.IsNullOrEmpty(globalConfig.WebProxyText) ? "-" + Convert.ToBase64String(Encoding.UTF8.GetBytes(globalConfig.WebProxyText)) : "";
+			string webProxyText = !string.IsNullOrEmpty(globalConfig.WebProxyText) ? "-" + BitConverter.ToString(Encoding.UTF8.GetBytes(globalConfig.WebProxyText)).Replace("-", "") : "";
 
 			ConfirmationsSemaphore ??= OS.CreateCrossProcessSemaphore(nameof(ConfirmationsSemaphore) + webProxyText);
 			GiftsSemaphore ??= OS.CreateCrossProcessSemaphore(nameof(GiftsSemaphore) + webProxyText);
diff --git a/ArchiSteamFarm/OS.cs b/ArchiSteamFarm/OS.cs
index fb0d53308..4429a491a 100644
--- a/ArchiSteamFarm/OS.cs
+++ b/ArchiSteamFarm/OS.cs
@@ -114,7 +114,7 @@ namespace ArchiSteamFarm {
 				return false;
 			}
 
-			string uniqueName = "Global\\" + GetOsResourceName(nameof(SingleInstance)) + "-" + Convert.ToBase64String(Encoding.UTF8.GetBytes(Directory.GetCurrentDirectory()));
+			string uniqueName = "Global\\" + GetOsResourceName(nameof(SingleInstance)) + "-" + BitConverter.ToString(Encoding.UTF8.GetBytes(Directory.GetCurrentDirectory())).Replace("-", "");
 
 			Mutex singleInstance = new Mutex(true, uniqueName, out bool result);