diff --git a/plugins/guests/darwin/cap/insert_public_key.rb b/plugins/guests/darwin/cap/insert_public_key.rb
index bd40279ab..909a8a3c2 100644
--- a/plugins/guests/darwin/cap/insert_public_key.rb
+++ b/plugins/guests/darwin/cap/insert_public_key.rb
@@ -6,7 +6,7 @@ module VagrantPlugins
       class InsertPublicKey
         def self.insert_public_key(machine, contents)
           comm = machine.communicate
-          contents = contents.chomp
+          contents = contents.strip << "\n"
 
           remote_path = "/tmp/vagrant-authorized-keys-#{Time.now.to_i}"
           Tempfile.open("vagrant-darwin-insert-public-key") do |f|
diff --git a/plugins/guests/freebsd/cap/insert_public_key.rb b/plugins/guests/freebsd/cap/insert_public_key.rb
index 86afb0b66..cf1fea35b 100644
--- a/plugins/guests/freebsd/cap/insert_public_key.rb
+++ b/plugins/guests/freebsd/cap/insert_public_key.rb
@@ -6,7 +6,7 @@ module VagrantPlugins
       class InsertPublicKey
         def self.insert_public_key(machine, contents)
           comm = machine.communicate
-          contents = contents.chomp
+          contents = contents.strip << "\n"
 
           remote_path = "/tmp/vagrant-authorized-keys-#{Time.now.to_i}"
           Tempfile.open("vagrant-freebsd-insert-public-key") do |f|
diff --git a/plugins/guests/linux/cap/insert_public_key.rb b/plugins/guests/linux/cap/insert_public_key.rb
index 08edb90ae..653720587 100644
--- a/plugins/guests/linux/cap/insert_public_key.rb
+++ b/plugins/guests/linux/cap/insert_public_key.rb
@@ -4,7 +4,7 @@ module VagrantPlugins
       class InsertPublicKey
         def self.insert_public_key(machine, contents)
           comm = machine.communicate
-          contents = contents.chomp << "\n"
+          contents = contents.strip << "\n"
 
           remote_path = "/tmp/vagrant-authorized-keys-#{Time.now.to_i}"
           Tempfile.open("vagrant-linux-insert-public-key") do |f|