diff --git a/Mist/Helpers/InstallerCreator.swift b/Mist/Helpers/InstallerCreator.swift
index 55c8525..7796072 100644
--- a/Mist/Helpers/InstallerCreator.swift
+++ b/Mist/Helpers/InstallerCreator.swift
@@ -55,14 +55,14 @@ enum InstallerCreator {
             let arguments: [String] = ["hdiutil", "detach", legacyDiskImageMountPointURL.path, "-force"]
             _ = try Shell.execute(arguments)
         } else {
-            guard let url: URL = URL(string: installer.distribution) else {
+            guard URL(string: installer.distribution) != nil else {
                 throw MistError.invalidURL(installer.distribution)
             }
 
-            let distributionURL: URL = temporaryURL.appendingPathComponent(url.lastPathComponent)
+            let installAssistantPackageURL: URL = temporaryURL.appendingPathComponent("InstallAssistant.pkg")
 
             !options.quiet ? PrettyPrint.print("Creating new installer '\(installer.temporaryInstallerURL.path)'...", noAnsi: options.noAnsi) : Mist.noop()
-            arguments = ["installer", "-pkg", distributionURL.path, "-target", installer.temporaryDiskImageMountPointURL.path]
+            arguments = ["installer", "-pkg", installAssistantPackageURL.path, "-target", installer.temporaryDiskImageMountPointURL.path]
             let variables: [String: String] = ["CM_BUILD": "CM_BUILD"]
             _ = try Shell.execute(arguments, environment: variables)
         }