diff --git a/cmd/posix-utils_nix.go b/cmd/posix-utils_nix.go
deleted file mode 100644
index f62a4aef2..000000000
--- a/cmd/posix-utils_nix.go
+++ /dev/null
@@ -1,25 +0,0 @@
-// +build !windows
-
-/*
- * Minio Cloud Storage, (C) 2016, 2017 Minio, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package cmd
-
-// isValidVolname verifies a volname name in accordance with object
-// layer requirements.
-func isValidVolname(volname string) bool {
-	return !(len(volname) < 3)
-}
diff --git a/cmd/posix-utils_test.go b/cmd/posix-utils_test.go
deleted file mode 100644
index a6428139a..000000000
--- a/cmd/posix-utils_test.go
+++ /dev/null
@@ -1,73 +0,0 @@
-/*
- * Minio Cloud Storage, (C) 2016 Minio, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package cmd
-
-import "testing"
-
-// Tests validate volume name.
-func TestIsValidVolname(t *testing.T) {
-	testCases := []struct {
-		volName    string
-		shouldPass bool
-	}{
-		// Cases which should pass the test.
-		// passing in valid bucket names.
-		{"lol", true},
-		{"1-this-is-valid", true},
-		{"1-this-too-is-valid-1", true},
-		{"this.works.too.1", true},
-		{"1234567", true},
-		{"123", true},
-		{"s3-eu-west-1.amazonaws.com", true},
-		{"ideas-are-more-powerful-than-guns", true},
-		{"testbucket", true},
-		{"1bucket", true},
-		{"bucket1", true},
-		{"$this-is-not-valid-too", true},
-		{"contains-$-dollar", true},
-		{"contains-^-carrot", true},
-		{"contains-$-dollar", true},
-		{"contains-$-dollar", true},
-		{".starts-with-a-dot", true},
-		{"ends-with-a-dot.", true},
-		{"ends-with-a-dash-", true},
-		{"-starts-with-a-dash", true},
-		{"THIS-BEINGS-WITH-UPPERCASe", true},
-		{"tHIS-ENDS-WITH-UPPERCASE", true},
-		{"ThisBeginsAndEndsWithUpperCase", true},
-		{"una ñina", true},
-		{"lalalallalallalalalallalallalala-theString-size-is-greater-than-64", true},
-		// cases for which test should fail.
-		// passing invalid bucket names.
-		{"", false},
-		{"/", false},
-		{"a", false},
-		{"ab", false},
-		{"ab/", true},
-		{"......", true},
-	}
-
-	for i, testCase := range testCases {
-		isValidVolname := isValidVolname(testCase.volName)
-		if testCase.shouldPass && !isValidVolname {
-			t.Errorf("Test case %d: Expected \"%s\" to be a valid bucket name", i+1, testCase.volName)
-		}
-		if !testCase.shouldPass && isValidVolname {
-			t.Errorf("Test case %d: Expected bucket name \"%s\" to be invalid", i+1, testCase.volName)
-		}
-	}
-}
diff --git a/cmd/posix-utils_windows.go b/cmd/posix-utils_windows.go
deleted file mode 100644
index f1ac25397..000000000
--- a/cmd/posix-utils_windows.go
+++ /dev/null
@@ -1,33 +0,0 @@
-// +build windows
-
-/*
- * Minio Cloud Storage, (C) 2017 Minio, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package cmd
-
-import (
-	"strings"
-)
-
-// isValidVolname verifies a volname name in accordance with object
-// layer requirements.
-func isValidVolname(volname string) bool {
-	if len(volname) < 3 {
-		return false
-	}
-	// Volname shouldn't have reserved characters on windows in it.
-	return !strings.ContainsAny(volname, `\:*?\"<>|`)
-}
diff --git a/cmd/posix.go b/cmd/posix.go
index b47e09a2d..a9e41545d 100644
--- a/cmd/posix.go
+++ b/cmd/posix.go
@@ -42,6 +42,21 @@ const (
 	maxAllowedIOError = 5
 )
 
+// isValidVolname verifies a volname name in accordance with object
+// layer requirements.
+func isValidVolname(volname string) bool {
+	if len(volname) < 3 {
+		return false
+	}
+
+	if runtime.GOOS == "windows" {
+		// Volname shouldn't have reserved characters in Windows.
+		return !strings.ContainsAny(volname, `\:*?\"<>|`)
+	}
+
+	return true
+}
+
 // posix - implements StorageAPI interface.
 type posix struct {
 	// Disk usage metrics
diff --git a/cmd/posix_test.go b/cmd/posix_test.go
index 54aff5077..03d0ec23e 100644
--- a/cmd/posix_test.go
+++ b/cmd/posix_test.go
@@ -33,6 +33,60 @@ import (
 	"github.com/minio/minio/pkg/disk"
 )
 
+// Tests validate volume name.
+func TestIsValidVolname(t *testing.T) {
+	testCases := []struct {
+		volName    string
+		shouldPass bool
+	}{
+		// Cases which should pass the test.
+		// passing in valid bucket names.
+		{"lol", true},
+		{"1-this-is-valid", true},
+		{"1-this-too-is-valid-1", true},
+		{"this.works.too.1", true},
+		{"1234567", true},
+		{"123", true},
+		{"s3-eu-west-1.amazonaws.com", true},
+		{"ideas-are-more-powerful-than-guns", true},
+		{"testbucket", true},
+		{"1bucket", true},
+		{"bucket1", true},
+		{"$this-is-not-valid-too", true},
+		{"contains-$-dollar", true},
+		{"contains-^-carrot", true},
+		{"contains-$-dollar", true},
+		{"contains-$-dollar", true},
+		{".starts-with-a-dot", true},
+		{"ends-with-a-dot.", true},
+		{"ends-with-a-dash-", true},
+		{"-starts-with-a-dash", true},
+		{"THIS-BEINGS-WITH-UPPERCASe", true},
+		{"tHIS-ENDS-WITH-UPPERCASE", true},
+		{"ThisBeginsAndEndsWithUpperCase", true},
+		{"una ñina", true},
+		{"lalalallalallalalalallalallalala-theString-size-is-greater-than-64", true},
+		// cases for which test should fail.
+		// passing invalid bucket names.
+		{"", false},
+		{"/", false},
+		{"a", false},
+		{"ab", false},
+		{"ab/", true},
+		{"......", true},
+	}
+
+	for i, testCase := range testCases {
+		isValidVolname := isValidVolname(testCase.volName)
+		if testCase.shouldPass && !isValidVolname {
+			t.Errorf("Test case %d: Expected \"%s\" to be a valid bucket name", i+1, testCase.volName)
+		}
+		if !testCase.shouldPass && isValidVolname {
+			t.Errorf("Test case %d: Expected bucket name \"%s\" to be invalid", i+1, testCase.volName)
+		}
+	}
+}
+
 // creates a temp dir and sets up posix layer.
 // returns posix layer, temp dir path to be used for the purpose of tests.
 func newPosixTestSetup() (StorageAPI, string, error) {
diff --git a/cmd/posix-utils_nix_test.go b/cmd/posix_unix_test.go
similarity index 100%
rename from cmd/posix-utils_nix_test.go
rename to cmd/posix_unix_test.go
diff --git a/cmd/posix-utils_windows_test.go b/cmd/posix_windows_test.go
similarity index 100%
rename from cmd/posix-utils_windows_test.go
rename to cmd/posix_windows_test.go