diff --git a/CHANGELOG.md b/CHANGELOG.md
index 138fb98..91c331a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## [0.4.2] 2018-05-05
+
+### Fixed
+- Fixed Linux support for `NSMutableString` to `String` initializer.
+
 ## [0.4.1] 2018-05-04
 
 ### Fixed
diff --git a/Sources/Manifest/Internal.swift b/Sources/Manifest/Internal.swift
index ed6da49..eda25dd 100644
--- a/Sources/Manifest/Internal.swift
+++ b/Sources/Manifest/Internal.swift
@@ -1,3 +1,13 @@
+import Foundation
+
+extension String {
+    
+    /// Adds Linux compatibility for the `String(_:)` initializer.
+    init(_ mutableString: NSMutableString) {
+        self = String(describing: mutableString)
+    }
+}
+
 internal var testManifest = """
 // swift-tools-version:4.0