diff --git a/doc/make.jl b/doc/make.jl
index f442368c73b8f..164fd32cf44b9 100644
--- a/doc/make.jl
+++ b/doc/make.jl
@@ -1,4 +1,5 @@
 # Install dependencies needed to build the documentation.
+Base.ACTIVE_PROJECT[] = nothing
 empty!(LOAD_PATH)
 push!(LOAD_PATH, @__DIR__, "@stdlib")
 empty!(DEPOT_PATH)