diff --git a/launcher/minecraft/MojangVersionFormat.cpp b/launcher/minecraft/MojangVersionFormat.cpp
index 6ee10ec15..bb782e47f 100644
--- a/launcher/minecraft/MojangVersionFormat.cpp
+++ b/launcher/minecraft/MojangVersionFormat.cpp
@@ -157,20 +157,6 @@ void MojangVersionFormat::readVersionProperties(const QJsonObject& in, VersionFi
     Bits::readString(in, "id", out->minecraftVersion);
     Bits::readString(in, "mainClass", out->mainClass);
     Bits::readString(in, "minecraftArguments", out->minecraftArguments);
-    if (out->minecraftArguments.isEmpty()) {
-        QString processArguments;
-        Bits::readString(in, "processArguments", processArguments);
-        QString toCompare = processArguments.toLower();
-        if (toCompare == "legacy") {
-            out->minecraftArguments = " ${auth_player_name} ${auth_session}";
-        } else if (toCompare == "username_session") {
-            out->minecraftArguments = "--username ${auth_player_name} --session ${auth_session}";
-        } else if (toCompare == "username_session_version") {
-            out->minecraftArguments = "--username ${auth_player_name} --session ${auth_session} --version ${profile_name}";
-        } else if (!toCompare.isEmpty()) {
-            out->addProblem(ProblemSeverity::Error, QObject::tr("processArguments is set to unknown value '%1'").arg(processArguments));
-        }
-    }
     Bits::readString(in, "type", out->type);
 
     Bits::readString(in, "assets", out->assets);