diff --git a/pkg/commands/testdata/testcase-configmaps/base/myapp/mycomponent/kustomization.yaml b/pkg/commands/testdata/testcase-configmaps/base/myapp/mycomponent/kustomization.yaml
index a1dafe5fb..8b9f791b6 100644
--- a/pkg/commands/testdata/testcase-configmaps/base/myapp/mycomponent/kustomization.yaml
+++ b/pkg/commands/testdata/testcase-configmaps/base/myapp/mycomponent/kustomization.yaml
@@ -1,4 +1,4 @@
-namePrefix: com1-
+namePrefix: p1-
 configMapGenerator:
 - name: com1
   behavior: create
diff --git a/pkg/commands/testdata/testcase-configmaps/base/myapp/mycomponent2/kustomization.yaml b/pkg/commands/testdata/testcase-configmaps/base/myapp/mycomponent2/kustomization.yaml
index 2228e5053..da1615aad 100644
--- a/pkg/commands/testdata/testcase-configmaps/base/myapp/mycomponent2/kustomization.yaml
+++ b/pkg/commands/testdata/testcase-configmaps/base/myapp/mycomponent2/kustomization.yaml
@@ -1,6 +1,6 @@
-namePrefix: com2-
+namePrefix: p2-
 configMapGenerator:
 - name: com2
   behavior: create
   literals:
-    - from=base
\ No newline at end of file
+    - from=base
diff --git a/pkg/commands/testdata/testcase-configmaps/expected.diff b/pkg/commands/testdata/testcase-configmaps/expected.diff
index d47a3ee21..7803718cb 100644
--- a/pkg/commands/testdata/testcase-configmaps/expected.diff
+++ b/pkg/commands/testdata/testcase-configmaps/expected.diff
@@ -12,5 +12,5 @@ diff -u -N /tmp/noop/v1_ConfigMap_com1.yaml /tmp/transformed/v1_ConfigMap_com1.y
    annotations: {}
    creationTimestamp: null
    labels: {}
--  name: com1-com1-8mk424df76
-+  name: com1-com1-687g9gmkdf
+-  name: p1-com1-cmdb776d5b
++  name: p1-com1-dhbbm922gd
diff --git a/pkg/commands/testdata/testcase-configmaps/expected.yaml b/pkg/commands/testdata/testcase-configmaps/expected.yaml
index ed24ea891..be56db9c2 100644
--- a/pkg/commands/testdata/testcase-configmaps/expected.yaml
+++ b/pkg/commands/testdata/testcase-configmaps/expected.yaml
@@ -8,7 +8,7 @@ metadata:
   annotations: {}
   creationTimestamp: null
   labels: {}
-  name: com1-com1-687g9gmkdf
+  name: p1-com1-dhbbm922gd
 ---
 apiVersion: v1
 data:
@@ -18,4 +18,4 @@ metadata:
   annotations: {}
   creationTimestamp: null
   labels: {}
-  name: com2-com2-bcd85m642t
+  name: p2-com2-c4b8md75k9
diff --git a/pkg/resmap/resmap.go b/pkg/resmap/resmap.go
index c282ac1d6..81c597a2f 100644
--- a/pkg/resmap/resmap.go
+++ b/pkg/resmap/resmap.go
@@ -222,13 +222,13 @@ func MergeWithOverride(maps ...ResMap) (ResMap, error) {
 					glog.V(4).Infof("Replace %v with %v", result[id].Object, r.Object)
 					r.Replace(result[id])
 					result[id] = r
-					result[id].ChangeBehavior(resource.BehaviorCreate)
+					result[id].SetBehavior(resource.BehaviorCreate)
 				case resource.BehaviorMerge:
 					glog.V(4).Infof("Merging %v with %v", result[id].Object, r.Object)
 					r.Merge(result[id])
 					result[id] = r
 					glog.V(4).Infof("Merged object is %v", result[id].Object)
-					result[id].ChangeBehavior(resource.BehaviorCreate)
+					result[id].SetBehavior(resource.BehaviorCreate)
 				default:
 					return nil, fmt.Errorf("Id %#v exists; must merge or replace.", id)
 				}
diff --git a/pkg/resmap/resmap_test.go b/pkg/resmap/resmap_test.go
index 187a7c21c..19849000a 100644
--- a/pkg/resmap/resmap_test.go
+++ b/pkg/resmap/resmap_test.go
@@ -151,7 +151,7 @@ metadata:
 	}
 }
 
-func TestMerge(t *testing.T) {
+func TestMergeWithoutOverride(t *testing.T) {
 	input1 := ResMap{
 		resource.NewResId(deploy, "deploy1"): resource.NewResourceFromMap(
 			map[string]interface{}{
@@ -199,3 +199,63 @@ func TestMerge(t *testing.T) {
 		t.Fatalf("%#v doesn't equal expected %#v", merged, expected)
 	}
 }
+
+func TestMergeWithOverride(t *testing.T) {
+	input1 := ResMap{
+		resource.NewResId(cmap, "cmap"): resource.NewResourceFromMap(
+			map[string]interface{}{
+				"apiVersion": "apps/v1",
+				"kind":       "ConfigMap",
+				"metadata": map[string]interface{}{
+					"name": "cmap",
+				},
+				"data": map[string]interface{}{
+					"a": "x",
+					"b": "y",
+				},
+			}),
+	}
+	input2 := ResMap{
+		resource.NewResId(cmap, "cmap"): resource.NewResourceFromMap(
+			map[string]interface{}{
+				"apiVersion": "apps/v1",
+				"kind":       "ConfigMap",
+				"metadata": map[string]interface{}{
+					"name": "cmap",
+				},
+				"data": map[string]interface{}{
+					"a": "u",
+					"b": "v",
+					"c": "w",
+				},
+			}),
+	}
+	input1[resource.NewResId(cmap, "cmap")].SetBehavior(resource.BehaviorCreate)
+	input2[resource.NewResId(cmap, "cmap")].SetBehavior(resource.BehaviorMerge)
+	input := []ResMap{input1, input2}
+	expected := ResMap{
+		resource.NewResId(cmap, "cmap"): resource.NewResourceFromMap(
+			map[string]interface{}{
+				"apiVersion": "apps/v1",
+				"kind":       "ConfigMap",
+				"metadata": map[string]interface{}{
+					"annotations": map[string]interface{}{},
+					"labels":      map[string]interface{}{},
+					"name":        "cmap",
+				},
+				"data": map[string]interface{}{
+					"a": "u",
+					"b": "v",
+					"c": "w",
+				},
+			}),
+	}
+	expected[resource.NewResId(cmap, "cmap")].SetBehavior(resource.BehaviorCreate)
+	merged, err := MergeWithOverride(input...)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if !reflect.DeepEqual(merged, expected) {
+		t.Fatalf("%#v doesn't equal expected %#v", merged, expected)
+	}
+}
diff --git a/pkg/resource/resource.go b/pkg/resource/resource.go
index 869470617..cdd8ec622 100644
--- a/pkg/resource/resource.go
+++ b/pkg/resource/resource.go
@@ -61,8 +61,8 @@ func (r *Resource) Behavior() GenerationBehavior {
 	return r.b
 }
 
-// ChangeBehavior changes the resource to the new behavior
-func (r *Resource) ChangeBehavior(b GenerationBehavior) {
+// SetBehavior changes the resource to the new behavior
+func (r *Resource) SetBehavior(b GenerationBehavior) {
 	r.b = b
 }