diff --git a/launcher/src/main/java/com/skcraft/launcher/launch/Runner.java b/launcher/src/main/java/com/skcraft/launcher/launch/Runner.java
index d6c2ea5..10d70fe 100644
--- a/launcher/src/main/java/com/skcraft/launcher/launch/Runner.java
+++ b/launcher/src/main/java/com/skcraft/launcher/launch/Runner.java
@@ -138,6 +138,7 @@ public class Runner implements Callable<Process>, ProgressObservable {
         addProxyArgs();
         addWindowArgs();
         addPlatformArgs();
+        addLegacyArgs();
 
         builder.classPath(getJarPath());
         builder.setMainClass(versionManifest.getMainClass());
@@ -320,6 +321,13 @@ public class Runner implements Callable<Process>, ProgressObservable {
         }
     }
 
+    /**
+     * Add arguments to make legacy Minecraft work.
+     */
+    private void addLegacyArgs() {
+        builder.getFlags().add("-Dminecraft.applet.TargetDirectory=" + instance.getContentDir());
+    }
+
     /**
      * Build the list of command substitutions.
      *