diff --git a/lib/vagrant-sshfs/cap/guest/linux/sshfs_forward_mount.rb b/lib/vagrant-sshfs/cap/guest/linux/sshfs_forward_mount.rb
index 4dc4a16..6b072ba 100644
--- a/lib/vagrant-sshfs/cap/guest/linux/sshfs_forward_mount.rb
+++ b/lib/vagrant-sshfs/cap/guest/linux/sshfs_forward_mount.rb
@@ -206,13 +206,18 @@ def self.sshfs_slave_mount(machine, opts, hostpath, expanded_guest_path)
           sshfs_cmd+= sshfs_opts + ' ' + sshfs_opts_append + ' '
 
           # The ssh command to connect to guest and then launch sshfs
-          # Note the backslash escapes for IdentityFile - handles spaces in key path
           ssh_opts = opts[:ssh_opts]
           ssh_opts+= ' -o User=' + machine.ssh_info[:username]
           ssh_opts+= ' -o Port=' + machine.ssh_info[:port].to_s
-          ssh_opts+= ' -o "IdentityFile=\"' + machine.ssh_info[:private_key_path][0] + '\""'
           ssh_opts+= ' -o UserKnownHostsFile=/dev/null '
           ssh_opts+= ' -F /dev/null ' # Don't pick up options from user's config
+          if machine.ssh_info.key?(:private_key_path) and
+             machine.ssh_info[:private_key_path] and
+             machine.ssh_info[:private_key_path][0]
+             # Add IdentityFile since there is one
+             # Note the backslash escapes for IdentityFile - handles spaces in key path
+            ssh_opts+= ' -o "IdentityFile=\"' + machine.ssh_info[:private_key_path][0] + '\""'
+          end
 
           # Use an SSH ProxyCommand when corresponding Vagrant setting is defined
           if machine.ssh_info[:proxy_command]
diff --git a/lib/vagrant-sshfs/cap/host/darwin/sshfs_reverse_mount.rb b/lib/vagrant-sshfs/cap/host/darwin/sshfs_reverse_mount.rb
index 78ae760..afe1cb9 100644
--- a/lib/vagrant-sshfs/cap/host/darwin/sshfs_reverse_mount.rb
+++ b/lib/vagrant-sshfs/cap/host/darwin/sshfs_reverse_mount.rb
@@ -74,6 +74,13 @@ def self.sshfs_mount(machine, opts)
           ssh_opts+= ' -o "IdentityFile=\"' + machine.ssh_info[:private_key_path][0] + '\""'
           ssh_opts+= ' -o UserKnownHostsFile=/dev/null '
           ssh_opts+= ' -F /dev/null ' # Don't pick up options from user's config
+          if machine.ssh_info.key?(:private_key_path) and
+             machine.ssh_info[:private_key_path] and
+             machine.ssh_info[:private_key_path][0]
+             # Add IdentityFile since there is one
+             # Note the backslash escapes for IdentityFile - handles spaces in key path
+            ssh_opts+= ' -o "IdentityFile=\"' + machine.ssh_info[:private_key_path][0] + '\""'
+          end
 
           ssh_opts_append = opts[:ssh_opts_append].to_s # provided by user
 
diff --git a/lib/vagrant-sshfs/cap/host/linux/sshfs_reverse_mount.rb b/lib/vagrant-sshfs/cap/host/linux/sshfs_reverse_mount.rb
index 8fdaefa..8d2cddf 100644
--- a/lib/vagrant-sshfs/cap/host/linux/sshfs_reverse_mount.rb
+++ b/lib/vagrant-sshfs/cap/host/linux/sshfs_reverse_mount.rb
@@ -67,12 +67,17 @@ def self.sshfs_mount(machine, opts)
           opts[:ssh_opts]+= ' -o ServerAliveInterval=30 '  # send keepalives
 
           # SSH connection options
-          # Note the backslash escapes for IdentityFile - handles spaces in key path
           ssh_opts = opts[:ssh_opts]
           ssh_opts+= ' -o Port=' + machine.ssh_info[:port].to_s
-          ssh_opts+= ' -o "IdentityFile=\"' + machine.ssh_info[:private_key_path][0] + '\""'
           ssh_opts+= ' -o UserKnownHostsFile=/dev/null '
           ssh_opts+= ' -F /dev/null ' # Don't pick up options from user's config
+          if machine.ssh_info.key?(:private_key_path) and
+             machine.ssh_info[:private_key_path] and
+             machine.ssh_info[:private_key_path][0]
+             # Add IdentityFile since there is one
+             # Note the backslash escapes for IdentityFile - handles spaces in key path
+            ssh_opts+= ' -o "IdentityFile=\"' + machine.ssh_info[:private_key_path][0] + '\""'
+          end
 
           ssh_opts_append = opts[:ssh_opts_append].to_s # provided by user