diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5000381d2..83f674851 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,7 +10,10 @@
 
 ##### Bug Fixes
 
-* None.
+* “.swift”-suffixed directory in xcodebuild arguments no longer detected as
+  Swift file.  
+  [Minh Nguyễn](https://github.com/1ec5)
+  [#574](https://github.com/jpsim/SourceKitten/issues/574)
 
 ## 0.22.0
 
diff --git a/Source/SourceKittenFramework/String+SourceKitten.swift b/Source/SourceKittenFramework/String+SourceKitten.swift
index 571bbd19c..05e57cf20 100644
--- a/Source/SourceKittenFramework/String+SourceKitten.swift
+++ b/Source/SourceKittenFramework/String+SourceKitten.swift
@@ -466,7 +466,9 @@ extension NSString {
 
 extension String {
     internal var isFile: Bool {
-        return FileManager.default.fileExists(atPath: self)
+        var isDirectory: ObjCBool = false
+        let exists = FileManager.default.fileExists(atPath: self, isDirectory: &isDirectory)
+        return exists && !isDirectory.boolValue
     }
 
     internal func capitalizingFirstLetter() -> String {
diff --git a/Source/SourceKittenFramework/library_wrapper.swift b/Source/SourceKittenFramework/library_wrapper.swift
index 42b49c512..0651afe1e 100644
--- a/Source/SourceKittenFramework/library_wrapper.swift
+++ b/Source/SourceKittenFramework/library_wrapper.swift
@@ -42,7 +42,7 @@ let toolchainLoader = Loader(searchPaths: [
     userApplicationsDir?.xcodeDeveloperDir.toolchainDir,
     userApplicationsDir?.xcodeBetaDeveloperDir.toolchainDir
 ].compactMap { path in
-    if let fullPath = path?.usrLibDir, fullPath.isFile {
+    if let fullPath = path?.usrLibDir, FileManager.default.fileExists(atPath: fullPath) {
         return fullPath
     }
     return nil