diff --git a/viper_test.go b/viper_test.go
index 592551c..6d25b93 100644
--- a/viper_test.go
+++ b/viper_test.go
@@ -39,7 +39,7 @@ hobbies:
 - go
 clothing:
   jacket: leather
-  trousers: denim
+  TROUSERS: denim
   pants:
     size: large
 age: 35
@@ -295,7 +295,7 @@ func TestUnmarshaling(t *testing.T) {
 	assert.False(t, InConfig("state"))
 	assert.Equal(t, "steve", Get("name"))
 	assert.Equal(t, []interface{}{"skateboarding", "snowboarding", "go"}, Get("hobbies"))
-	assert.Equal(t, map[string]interface{}{"jacket": "leather", "trousers": "denim", "pants": map[string]interface{}{"size": "large"}}, Get("clothing"))
+	assert.Equal(t, map[string]interface{}{"jacket": "leather", "TROUSERS": "denim", "pants": map[string]interface{}{"size": "large"}}, Get("clothing"))
 	assert.Equal(t, 35, Get("age"))
 }
 
@@ -491,11 +491,11 @@ func TestSetEnvKeyReplacer(t *testing.T) {
 func TestAllKeys(t *testing.T) {
 	initConfigs()
 
-	ks := sort.StringSlice{"title", "newkey", "owner.organization", "owner.dob", "owner.bio", "name", "beard", "ppu", "batters.batter", "hobbies", "clothing.jacket", "clothing.trousers", "clothing.pants.size", "age", "hacker", "id", "type", "eyes", "p_id", "p_ppu", "p_batters.batter.type", "p_type", "p_name", "foos",
+	ks := sort.StringSlice{"title", "newkey", "owner.organization", "owner.dob", "owner.bio", "name", "beard", "ppu", "batters.batter", "hobbies", "clothing.jacket", "clothing.TROUSERS", "clothing.pants.size", "age", "hacker", "id", "type", "eyes", "p_id", "p_ppu", "p_batters.batter.type", "p_type", "p_name", "foos",
 		"title_dotenv", "type_dotenv", "name_dotenv",
 	}
 	dob, _ := time.Parse(time.RFC3339, "1979-05-27T07:32:00Z")
-	all := map[string]interface{}{"owner": map[string]interface{}{"organization": "MongoDB", "bio": "MongoDB Chief Developer Advocate & Hacker at Large", "dob": dob}, "title": "TOML Example", "ppu": 0.55, "eyes": "brown", "clothing": map[string]interface{}{"trousers": "denim", "jacket": "leather", "pants": map[string]interface{}{"size": "large"}}, "id": "0001", "batters": map[string]interface{}{"batter": []interface{}{map[string]interface{}{"type": "Regular"}, map[string]interface{}{"type": "Chocolate"}, map[string]interface{}{"type": "Blueberry"}, map[string]interface{}{"type": "Devil's Food"}}}, "hacker": true, "beard": true, "hobbies": []interface{}{"skateboarding", "snowboarding", "go"}, "age": 35, "type": "donut", "newkey": "remote", "name": "Cake", "p_id": "0001", "p_ppu": "0.55", "p_name": "Cake", "p_batters": map[string]interface{}{"batter": map[string]interface{}{"type": "Regular"}}, "p_type": "donut", "foos": []map[string]interface{}{map[string]interface{}{"foo": []map[string]interface{}{map[string]interface{}{"key": 1}, map[string]interface{}{"key": 2}, map[string]interface{}{"key": 3}, map[string]interface{}{"key": 4}}}}, "title_dotenv": "DotEnv Example", "type_dotenv": "donut", "name_dotenv": "Cake"}
+	all := map[string]interface{}{"owner": map[string]interface{}{"organization": "MongoDB", "bio": "MongoDB Chief Developer Advocate & Hacker at Large", "dob": dob}, "title": "TOML Example", "ppu": 0.55, "eyes": "brown", "clothing": map[string]interface{}{"TROUSERS": "denim", "jacket": "leather", "pants": map[string]interface{}{"size": "large"}}, "id": "0001", "batters": map[string]interface{}{"batter": []interface{}{map[string]interface{}{"type": "Regular"}, map[string]interface{}{"type": "Chocolate"}, map[string]interface{}{"type": "Blueberry"}, map[string]interface{}{"type": "Devil's Food"}}}, "hacker": true, "beard": true, "hobbies": []interface{}{"skateboarding", "snowboarding", "go"}, "age": 35, "type": "donut", "newkey": "remote", "name": "Cake", "p_id": "0001", "p_ppu": "0.55", "p_name": "Cake", "p_batters": map[string]interface{}{"batter": map[string]interface{}{"type": "Regular"}}, "p_type": "donut", "foos": []map[string]interface{}{map[string]interface{}{"foo": []map[string]interface{}{map[string]interface{}{"key": 1}, map[string]interface{}{"key": 2}, map[string]interface{}{"key": 3}, map[string]interface{}{"key": 4}}}}, "title_dotenv": "DotEnv Example", "type_dotenv": "donut", "name_dotenv": "Cake"}
 
 	allkeys := sort.StringSlice(AllKeys())
 	allkeys.Sort()
@@ -878,14 +878,14 @@ func TestFindsNestedKeys(t *testing.T) {
 		"ppu":       0.55,
 		"clothing": map[string]interface{}{
 			"jacket":   "leather",
-			"trousers": "denim",
+			"TROUSERS": "denim",
 			"pants": map[string]interface{}{
 				"size": "large",
 			},
 		},
 		"clothing.jacket":     "leather",
 		"clothing.pants.size": "large",
-		"clothing.trousers":   "denim",
+		"clothing.TROUSERS":   "denim",
 		"owner.dob":           dob,
 		"beard":               true,
 		"foos": []map[string]interface{}{
@@ -925,7 +925,7 @@ func TestReadBufConfig(t *testing.T) {
 	assert.False(t, v.InConfig("state"))
 	assert.Equal(t, "steve", v.Get("name"))
 	assert.Equal(t, []interface{}{"skateboarding", "snowboarding", "go"}, v.Get("hobbies"))
-	assert.Equal(t, map[string]interface{}{"jacket": "leather", "trousers": "denim", "pants": map[string]interface{}{"size": "large"}}, v.Get("clothing"))
+	assert.Equal(t, map[string]interface{}{"jacket": "leather", "TROUSERS": "denim", "pants": map[string]interface{}{"size": "large"}}, v.Get("clothing"))
 	assert.Equal(t, 35, v.Get("age"))
 }
 
@@ -1212,7 +1212,7 @@ clothing:
   jacket: leather
   pants:
     size: large
-  trousers: denim
+  TROUSERS: denim
 eyes: brown
 hacker: true
 hobbies:
@@ -1465,7 +1465,7 @@ func TestShadowedNestedValue(t *testing.T) {
 	config := `name: steve
 clothing:
   jacket: leather
-  trousers: denim
+  TROUSERS: denim
   pants:
     size: large
 `