diff --git a/src/webserver/SessionActions.jl b/src/webserver/SessionActions.jl
index a8ef828d12..78819fa489 100644
--- a/src/webserver/SessionActions.jl
+++ b/src/webserver/SessionActions.jl
@@ -221,7 +221,7 @@ function new(session::ServerSession; run_async=true, notebook_id::UUID=uuid1())
     notebook = if session.options.compiler.sysimage === nothing
         emptynotebook()
     else
-        Notebook([Cell("import Pkg"), Cell("# This cell disables Pluto's package manager and activates the global environment. Click on ? inside the bubble next to Pkg.activate to learn more.\n# (added automatically because a sysimage is used)\nPkg.activate()"), Cell()])
+        Notebook([Cell("import Pkg"), Cell("# This cell disables Pluto's package manager and activates the global environment. Click on ? inside the bubble next to Pkg.activate to learn more.\n# (added automatically because a sysimage is used)\nPkg.activate(;temp=true)"), Cell()])
     end
 
     # Run NewNotebookEvent handler before assigning ID