diff --git a/base/distributed/cluster.jl b/base/distributed/cluster.jl
index 5d97485b17dfb..22051fb4d4d5a 100644
--- a/base/distributed/cluster.jl
+++ b/base/distributed/cluster.jl
@@ -595,8 +595,8 @@ end
 
 additional_io_objs=Dict()
 function launch_additional(np::Integer, cmd::Cmd)
-    io_objs = Vector{Any}(np)
-    addresses = Vector{Any}(np)
+    io_objs = Vector{Any}(uninitialized, np)
+    addresses = Vector{Any}(uninitialized, np)
 
     for i in 1:np
         io = open(detach(cmd), "r+")
diff --git a/base/distributed/macros.jl b/base/distributed/macros.jl
index c021da49b8c9a..32e3ccaf53abb 100644
--- a/base/distributed/macros.jl
+++ b/base/distributed/macros.jl
@@ -214,7 +214,7 @@ function splitrange(N::Int, np::Int)
     each = div(N,np)
     extras = rem(N,np)
     nchunks = each > 0 ? np : extras
-    chunks = Vector{UnitRange{Int}}(nchunks)
+    chunks = Vector{UnitRange{Int}}(uninitialized, nchunks)
     lo = 1
     for i in 1:nchunks
         hi = lo + each - 1
diff --git a/base/distributed/managers.jl b/base/distributed/managers.jl
index 62cb9133725f1..9f35e1a26dced 100644
--- a/base/distributed/managers.jl
+++ b/base/distributed/managers.jl
@@ -122,7 +122,7 @@ end
 function launch(manager::SSHManager, params::Dict, launched::Array, launch_ntfy::Condition)
     # Launch one worker on each unique host in parallel. Additional workers are launched later.
     # Wait for all launches to complete.
-    launch_tasks = Vector{Any}(length(manager.machines))
+    launch_tasks = Vector{Any}(uninitialized, length(manager.machines))
 
     for (i,(machine, cnt)) in enumerate(manager.machines)
         let machine=machine, cnt=cnt
diff --git a/base/distributed/pmap.jl b/base/distributed/pmap.jl
index 78733bbb35763..aec5ec9cf01ca 100644
--- a/base/distributed/pmap.jl
+++ b/base/distributed/pmap.jl
@@ -255,7 +255,7 @@ julia> collect(c)
 ```
 """
 function head_and_tail(c, n)
-    head = Vector{eltype(c)}(n)
+    head = Vector{eltype(c)}(uninitialized, n)
     s = start(c)
     i = 0
     while i < n && !done(c, s)