diff --git a/plugins/guests/smartos/config.rb b/plugins/guests/smartos/config.rb
index 65e9f8ea2..201141ed5 100644
--- a/plugins/guests/smartos/config.rb
+++ b/plugins/guests/smartos/config.rb
@@ -8,11 +8,20 @@ module VagrantPlugins
       attr_accessor :device
 
       def initialize
-        @halt_timeout = 30
-        @halt_check_interval = 1
+        @halt_timeout = UNSET_VALUE
+        @halt_check_interval = UNSET_VALUE
         @suexec_cmd = 'pfexec'
         @device = "e1000g"
       end
+
+      def finalize!
+        if @halt_timeout != UNSET_VALUE
+          puts "smartos.halt_timeout is deprecated and will be removed in Vagrant 1.7"
+        end
+        if @halt_check_interval != UNSET_VALUE
+          puts "smartos.halt_check_interval is deprecated and will be removed in Vagrant 1.7"
+        end
+      end
     end
   end
 end
diff --git a/plugins/guests/solaris/config.rb b/plugins/guests/solaris/config.rb
index e36b9c127..e0a6a486b 100644
--- a/plugins/guests/solaris/config.rb
+++ b/plugins/guests/solaris/config.rb
@@ -8,11 +8,20 @@ module VagrantPlugins
       attr_accessor :device
 
       def initialize
-        @halt_timeout = 30
-        @halt_check_interval = 1
+        @halt_timeout = UNSET_VALUE
+        @halt_check_interval = UNSET_VALUE
         @suexec_cmd = 'sudo'
         @device = "e1000g"
       end
+
+      def finalize!
+        if @halt_timeout != UNSET_VALUE
+          puts "solaris.halt_timeout is deprecated and will be removed in Vagrant 1.7"
+        end
+        if @halt_check_interval != UNSET_VALUE
+          puts "solaris.halt_check_interval is deprecated and will be removed in Vagrant 1.7"
+        end
+      end
     end
   end
 end
diff --git a/plugins/guests/solaris11/config.rb b/plugins/guests/solaris11/config.rb
index 9a177ceb5..935e0d9b9 100644
--- a/plugins/guests/solaris11/config.rb
+++ b/plugins/guests/solaris11/config.rb
@@ -12,11 +12,20 @@ module VagrantPlugins
       attr_accessor :device
 
       def initialize
-        @halt_timeout = 30
-        @halt_check_interval = 1
+        @halt_timeout = UNSET_VALUE
+        @halt_check_interval = UNSET_VALUE
         @suexec_cmd = 'sudo'
         @device = "net"
       end
+
+      def finalize!
+        if @halt_timeout != UNSET_VALUE
+          puts "solaris11.halt_timeout is deprecated and will be removed in Vagrant 1.7"
+        end
+        if @halt_check_interval != UNSET_VALUE
+          puts "solaris11.halt_check_interval is deprecated and will be removed in Vagrant 1.7"
+        end
+      end
     end
   end
 end