diff --git a/src/plugins/git.jl b/src/plugins/git.jl
index 19243a6..250b074 100644
--- a/src/plugins/git.jl
+++ b/src/plugins/git.jl
@@ -62,7 +62,7 @@ end
 
 # Create the .gitignore.
 function hook(p::Git, t::Template, pkg_dir::AbstractString)
-    ignore = mapreduce(gitignore, append!, t.plugins)
+    ignore = mapreduce(gitignore, vcat, t.plugins)
     # Only ignore manifests at the repo root.
     p.manifest || "Manifest.toml" in ignore || push!(ignore, "/Manifest.toml")
     unique!(sort!(ignore))