diff --git a/plugins/guests/solaris/guest.rb b/plugins/guests/solaris/guest.rb
index 4256c61cd..d0c84f94a 100644
--- a/plugins/guests/solaris/guest.rb
+++ b/plugins/guests/solaris/guest.rb
@@ -7,7 +7,7 @@ module VagrantPlugins
     # Contributed by Blake Irvin <b.irvin@modcloth.com>
     class Guest < Vagrant.plugin("2", :guest)
       def detect?(machine)
-        machine.communicate.test("uname -s | grep SunOS")
+        machine.communicate.test("uname -sr | grep SunOS | grep -v 5.11")
       end
     end
   end
diff --git a/plugins/guests/solaris11/guest.rb b/plugins/guests/solaris11/guest.rb
index de43769b4..a4d3c5b75 100644
--- a/plugins/guests/solaris11/guest.rb
+++ b/plugins/guests/solaris11/guest.rb
@@ -8,7 +8,7 @@ module VagrantPlugins
   module GuestSolaris11
     class Guest < Vagrant.plugin("2", :guest)
       def detect?(machine)
-        machine.communicate.test("uname -s | grep SunOS")
+        machine.communicate.test("uname -sr | grep 'SunOS 5.11'")
       end
     end
   end