diff --git a/platformio/commands/run.py b/platformio/commands/run.py
index 7880f3fa..49d5e23f 100644
--- a/platformio/commands/run.py
+++ b/platformio/commands/run.py
@@ -191,7 +191,8 @@ def _autoinstall_platform(ctx, platform, targets):
         if upload_tools:
             cmd_options['with_package'] = ["uploader"]
 
-    elif (set(p.pkg_aliases_to_names(["toolchain"])) <=
+    elif (platform in installed_platforms and
+          set(p.pkg_aliases_to_names(["toolchain"])) <=
           set(p.get_installed_packages())):
         return