diff --git a/Mist/Extensions/FileManager+Extension.swift b/Mist/Extensions/FileManager+Extension.swift
index 139c0c5..48f89eb 100644
--- a/Mist/Extensions/FileManager+Extension.swift
+++ b/Mist/Extensions/FileManager+Extension.swift
@@ -17,7 +17,7 @@ extension FileManager {
             .totalFileAllocatedSizeKey
         ]
 
-        guard let enumerator: FileManager.DirectoryEnumerator = self.enumerator(at: url, includingPropertiesForKeys: Array(urlResourceKeys), options: [], errorHandler: { _, error -> Bool in
+        guard let enumerator: FileManager.DirectoryEnumerator = enumerator(at: url, includingPropertiesForKeys: Array(urlResourceKeys), options: [], errorHandler: { _, error -> Bool in
             enumeratorError = error
             return false
         }) else {
diff --git a/Mist/Extensions/Sequence+Extension.swift b/Mist/Extensions/Sequence+Extension.swift
index 3209ed3..d73b651 100644
--- a/Mist/Extensions/Sequence+Extension.swift
+++ b/Mist/Extensions/Sequence+Extension.swift
@@ -10,11 +10,11 @@ import Yams
 
 extension Sequence where Iterator.Element == [String: Any] {
     func firmwaresCSVString() -> String {
-        "Signed,Name,Version,Build,Size,Date,Compatible\n" + self.map { $0.firmwareCSVString() }.joined()
+        "Signed,Name,Version,Build,Size,Date,Compatible\n" + map { $0.firmwareCSVString() }.joined()
     }
 
     func installersCSVString() -> String {
-        "Identifier,Name,Version,Build,Size,Date,Compatible\n" + self.map { $0.installerCSVString() }.joined()
+        "Identifier,Name,Version,Build,Size,Date,Compatible\n" + map { $0.installerCSVString() }.joined()
     }
 
     func jsonString() throws -> String {
diff --git a/Mist/Extensions/String+Extension.swift b/Mist/Extensions/String+Extension.swift
index b6e30ba..8b072e0 100644
--- a/Mist/Extensions/String+Extension.swift
+++ b/Mist/Extensions/String+Extension.swift
@@ -26,7 +26,7 @@ extension String {
     static let tccDatabasePath: String = "/Library/Application Support/com.apple.TCC/TCC.db"
 
     func stringWithSubstitutions(name: String, version: String, build: String) -> String {
-        self.replacingOccurrences(of: "%NAME%", with: name)
+        replacingOccurrences(of: "%NAME%", with: name)
             .replacingOccurrences(of: "%VERSION%", with: version)
             .replacingOccurrences(of: "%BUILD%", with: build)
             .replacingOccurrences(of: "//", with: "/")
diff --git a/Mist/Extensions/URL+Extension.swift b/Mist/Extensions/URL+Extension.swift
index 3a1e4b1..4c87c21 100644
--- a/Mist/Extensions/URL+Extension.swift
+++ b/Mist/Extensions/URL+Extension.swift
@@ -16,7 +16,7 @@ extension URL {
             .totalFileAllocatedSizeKey
         ]
 
-        let resourceValues: URLResourceValues = try self.resourceValues(forKeys: urlResourceKeys)
+        let resourceValues: URLResourceValues = try resourceValues(forKeys: urlResourceKeys)
 
         guard let isRegularFile: Bool = resourceValues.isRegularFile,
             isRegularFile else {
diff --git a/Mist/Views/Activity/ActivityView.swift b/Mist/Views/Activity/ActivityView.swift
index dc1fb36..376706b 100644
--- a/Mist/Views/Activity/ActivityView.swift
+++ b/Mist/Views/Activity/ActivityView.swift
@@ -148,7 +148,7 @@ struct ActivityView: View {
                     }
 
                     taskManager.taskGroups[taskGroupIndex].tasks[taskIndex].state = .error
-                    self.error = failure as? MistError ?? MistError.generalError(failure.localizedDescription)
+                    error = failure as? MistError ?? MistError.generalError(failure.localizedDescription)
                     alertType = .error
                     showAlert = true