diff --git a/src/app/FakeLib/EnvironmentHelper.fs b/src/app/FakeLib/EnvironmentHelper.fs
index 520f915d4e4..9ab457bce34 100644
--- a/src/app/FakeLib/EnvironmentHelper.fs
+++ b/src/app/FakeLib/EnvironmentHelper.fs
@@ -1,4 +1,4 @@
-[<AutoOpen>]
+[<AutoOpen>]
 /// This module contains functions which allow to read and write environment variables and build parameters
 module Fake.EnvironmentHelper
 
@@ -119,8 +119,9 @@ let isUnix = Environment.OSVersion.Platform = PlatformID.Unix
 
 /// Determines if the current system is a MacOs system
 let isMacOS =
-    // osascript is the AppleScript interpreter on OS X
-    File.Exists "/usr/bin/osascript"
+    (Environment.OSVersion.Platform = PlatformID.MacOSX) ||
+      // osascript is the AppleScript interpreter on OS X
+      File.Exists "/usr/bin/osascript"
 
 /// Determines if the current system is a Linux system
 let isLinux = int System.Environment.OSVersion.Platform |> fun p -> (p = 4) || (p = 6) || (p = 128)