diff --git a/src/API.jl b/src/API.jl
index 401ca06be1..5e5723a8b7 100644
--- a/src/API.jl
+++ b/src/API.jl
@@ -281,7 +281,7 @@ function add(ctx::Context, pkgs::Vector{PackageSpec}; preserve::PreserveLevel=Op
         end
     end
 
-    repo_pkgs = [pkg for pkg in pkgs if (pkg.repo.source !== nothing || pkg.repo.rev !== nothing)]
+    repo_pkgs = PackageSpec[pkg for pkg in pkgs if (pkg.repo.source !== nothing || pkg.repo.rev !== nothing)]
     new_git = handle_repos_add!(ctx, repo_pkgs)
     # repo + unpinned -> name, uuid, repo.rev, repo.source, tree_hash
     # repo + pinned -> name, uuid, tree_hash
diff --git a/src/Operations.jl b/src/Operations.jl
index 8efa29c042..7428df6b5a 100644
--- a/src/Operations.jl
+++ b/src/Operations.jl
@@ -1319,7 +1319,7 @@ function build_versions(ctx::Context, uuids::Set{UUID}; verbose=false)
         ispath(buildfile(path)) && push!(builds, (uuid, name, path, version))
     end
     # toposort builds by dependencies
-    order = dependency_order_uuids(ctx.env, map(first, builds))
+    order = dependency_order_uuids(ctx.env, UUID[first(build) for build in builds])
     sort!(builds, by = build -> order[first(build)])
     max_name = maximum(build->textwidth(build[2]), builds; init=0)
 
diff --git a/src/Resolve/Resolve.jl b/src/Resolve/Resolve.jl
index 36e818fe13..dc11c7540f 100644
--- a/src/Resolve/Resolve.jl
+++ b/src/Resolve/Resolve.jl
@@ -309,7 +309,7 @@ function greedysolver(graph::Graph)
     gconstr = graph.gconstr
 
     # initialize solution: all uninstalled
-    sol = [spp[p0] for p0 = 1:np]
+    sol = Int[spp[p0] for p0 = 1:np]
 
     # packages which are not allowed to be uninstalled
     # (NOTE: this is potentially a superset of graph.req_inds,