diff --git a/plugins/kernel_v2/config/vm.rb b/plugins/kernel_v2/config/vm.rb
index e8abe106c..794db57b2 100644
--- a/plugins/kernel_v2/config/vm.rb
+++ b/plugins/kernel_v2/config/vm.rb
@@ -145,18 +145,16 @@ module VagrantPlugins
           new_provs   = []
           other_provs = other.provisioners.dup
           @provisioners.each do |p|
-            if p.name
-              other_p = other_provs.find { |o| p.name == o.name }
-              if other_p
-                # There is an override. Take it.
-                other_p.config = p.config.merge(other_p.config)
-                other_p.run    ||= p.run
-                next if !other_p.preserve_order
+            other_p = other_provs.find { |o| p.id == o.id }
+            if other_p
+              # There is an override. Take it.
+              other_p.config = p.config.merge(other_p.config)
+              other_p.run    ||= p.run
+              next if !other_p.preserve_order
 
-                # We're preserving order, delete from other
-                p = other_p
-                other_provs.delete(other_p)
-              end
+              # We're preserving order, delete from other
+              p = other_p
+              other_provs.delete(other_p)
             end
 
             # There is an override, merge it into the
diff --git a/plugins/kernel_v2/config/vm_provisioner.rb b/plugins/kernel_v2/config/vm_provisioner.rb
index aedafe9fe..59833c850 100644
--- a/plugins/kernel_v2/config/vm_provisioner.rb
+++ b/plugins/kernel_v2/config/vm_provisioner.rb
@@ -9,6 +9,15 @@ module VagrantPlugins
       # @return [String]
       attr_reader :name
 
+      # Internal unique name for this provisioner
+      # Set to the given :name if exists, otherwise
+      # it's set as a UUID.
+      #
+      # Note: This is for internal use only.
+      #
+      # @return [String]
+      attr_reader :id
+
       # The type of the provisioner that should be registered
       # as a plugin.
       #
@@ -35,6 +44,7 @@ module VagrantPlugins
         @logger = Log4r::Logger.new("vagrant::config::vm::provisioner")
         @logger.debug("Provisioner defined: #{name}")
 
+        @id = name || SecureRandom.uuid
         @config  = nil
         @invalid = false
         @name    = name
diff --git a/test/unit/plugins/kernel_v2/config/vm_test.rb b/test/unit/plugins/kernel_v2/config/vm_test.rb
index 17d121ed7..ef3734898 100644
--- a/test/unit/plugins/kernel_v2/config/vm_test.rb
+++ b/test/unit/plugins/kernel_v2/config/vm_test.rb
@@ -424,6 +424,24 @@ describe VagrantPlugins::Kernel_V2::VMConfig do
       expect{ subject.finalize! }.to_not raise_error
     end
 
+    it "generates a uuid if no name was provided" do
+      allow(SecureRandom).to receive(:uuid).and_return("MY_CUSTOM_VALUE")
+
+      subject.provision("shell", path: "foo") { |s| s.inline = "foo" }
+      subject.finalize!
+
+      r = subject.provisioners
+      expect(r[0].id).to eq("MY_CUSTOM_VALUE")
+    end
+
+    it "sets id as name if a name was provided" do
+      subject.provision("ghost", type: "shell", path: "motoko") { |s| s.inline = "motoko" }
+      subject.finalize!
+
+      r = subject.provisioners
+      expect(r[0].id).to eq(:ghost)
+    end
+
     describe "merging" do
       it "ignores non-overriding runs" do
         subject.provision("shell", inline: "foo", run: "once")
@@ -439,6 +457,16 @@ describe VagrantPlugins::Kernel_V2::VMConfig do
         expect(merged_provs[1].run).to eq("always")
       end
 
+      it "does not merge duplicate provisioners" do
+        subject.provision("shell", inline: "foo")
+        subject.provision("shell", inline: "bar")
+
+        merged = subject.merge(subject)
+        merged_provs = merged.provisioners
+
+        expect(merged_provs.length).to eql(2)
+      end
+
       it "copies the configs" do
         subject.provision("shell", inline: "foo")
         subject_provs = subject.provisioners