diff --git a/terraform/transform_flatten.go b/terraform/transform_flatten.go
index 206bf97bb..c727b3523 100644
--- a/terraform/transform_flatten.go
+++ b/terraform/transform_flatten.go
@@ -1,8 +1,6 @@
 package terraform
 
 import (
-	"fmt"
-
 	"github.com/hashicorp/terraform/dag"
 )
 
@@ -21,87 +19,3 @@ type GraphNodeFlatGraph interface {
 type GraphNodeFlattenable interface {
 	Flatten(path []string) (dag.Vertex, error)
 }
-
-// FlattenTransformer is a transformer that goes through the graph, finds
-// subgraphs that can be flattened, and flattens them into this graph,
-// removing the prior subgraph node.
-type FlattenTransformer struct{}
-
-func (t *FlattenTransformer) Transform(g *Graph) error {
-	for _, v := range g.Vertices() {
-		fn, ok := v.(GraphNodeFlatGraph)
-		if !ok {
-			continue
-		}
-
-		// If we don't want to be flattened, don't do it
-		subgraph := fn.FlattenGraph()
-		if subgraph == nil {
-			continue
-		}
-
-		// Get all the things that depend on this node. We'll re-connect
-		// dependents later. We have to copy these here since the UpEdges
-		// value will be deleted after the Remove below.
-		dependents := make([]dag.Vertex, 0, 5)
-		for _, v := range g.UpEdges(v).List() {
-			dependents = append(dependents, v)
-		}
-
-		// Remove the old node
-		g.Remove(v)
-
-		// Go through the subgraph and flatten all the nodes
-		for _, sv := range subgraph.Vertices() {
-			// If the vertex already has a subpath then we assume it has
-			// already been flattened. Ignore it.
-			if _, ok := sv.(GraphNodeSubPath); ok {
-				continue
-			}
-
-			fn, ok := sv.(GraphNodeFlattenable)
-			if !ok {
-				return fmt.Errorf(
-					"unflattenable node: %s %T",
-					dag.VertexName(sv), sv)
-			}
-
-			v, err := fn.Flatten(subgraph.Path)
-			if err != nil {
-				return fmt.Errorf(
-					"error flattening %s (%T): %s",
-					dag.VertexName(sv), sv, err)
-			}
-
-			if v == nil {
-				subgraph.Remove(v)
-			} else {
-				subgraph.Replace(sv, v)
-			}
-		}
-
-		// Now that we've handled any changes to the graph that are
-		// needed, we can add them all to our graph along with their edges.
-		for _, sv := range subgraph.Vertices() {
-			g.Add(sv)
-		}
-		for _, se := range subgraph.Edges() {
-			g.Connect(se)
-		}
-
-		// Connect the dependencies for all the new nodes that we added.
-		// This will properly connect variables to their sources, for example.
-		for _, sv := range subgraph.Vertices() {
-			g.ConnectDependent(sv)
-		}
-
-		// Re-connect all the things that dependent on the graph
-		// we just flattened. This should connect them back into the
-		// correct nodes if their DependentOn() is setup correctly.
-		for _, v := range dependents {
-			g.ConnectDependent(v)
-		}
-	}
-
-	return nil
-}
diff --git a/terraform/transform_flatten_test.go b/terraform/transform_flatten_test.go
deleted file mode 100644
index 68b49d9a5..000000000
--- a/terraform/transform_flatten_test.go
+++ /dev/null
@@ -1,88 +0,0 @@
-package terraform
-
-import (
-	"strings"
-	"testing"
-)
-
-func TestFlattenTransformer(t *testing.T) {
-	mod := testModule(t, "transform-flatten")
-
-	var b BasicGraphBuilder
-	b = BasicGraphBuilder{
-		Steps: []GraphTransformer{
-			&ConfigTransformerOld{Module: mod},
-			&VertexTransformer{
-				Transforms: []GraphVertexTransformer{
-					&ExpandTransform{
-						Builder: &b,
-					},
-				},
-			},
-			&FlattenTransformer{},
-		},
-	}
-
-	g, err := b.Build(rootModulePath)
-	if err != nil {
-		t.Fatalf("err: %s", err)
-	}
-
-	actual := strings.TrimSpace(g.String())
-	expected := strings.TrimSpace(testTransformFlattenStr)
-	if actual != expected {
-		t.Fatalf("bad:\n\n%s", actual)
-	}
-}
-
-func TestFlattenTransformer_withProxy(t *testing.T) {
-	mod := testModule(t, "transform-flatten")
-
-	var b BasicGraphBuilder
-	b = BasicGraphBuilder{
-		Steps: []GraphTransformer{
-			&ConfigTransformerOld{Module: mod},
-			&VertexTransformer{
-				Transforms: []GraphVertexTransformer{
-					&ExpandTransform{
-						Builder: &b,
-					},
-				},
-			},
-			&FlattenTransformer{},
-			&ProxyTransformer{},
-		},
-	}
-
-	g, err := b.Build(rootModulePath)
-	if err != nil {
-		t.Fatalf("err: %s", err)
-	}
-
-	actual := strings.TrimSpace(g.String())
-	expected := strings.TrimSpace(testTransformFlattenProxyStr)
-	if actual != expected {
-		t.Fatalf("bad:\n\n%s", actual)
-	}
-}
-
-const testTransformFlattenStr = `
-aws_instance.parent
-aws_instance.parent-output
-module.child.aws_instance.child
-  module.child.var.var
-module.child.plan-destroy
-module.child.var.var
-  aws_instance.parent
-`
-
-const testTransformFlattenProxyStr = `
-aws_instance.parent
-aws_instance.parent-output
-module.child.aws_instance.child
-  aws_instance.parent
-  module.child.var.var
-module.child.plan-destroy
-module.child.var.var
-  aws_instance.parent
-`