diff --git a/Pilz/Runtime/RuntimeInformationsEx.vb b/Pilz/Runtime/RuntimeInformationsEx.vb
index 1a5dd21..d6f53c3 100644
--- a/Pilz/Runtime/RuntimeInformationsEx.vb
+++ b/Pilz/Runtime/RuntimeInformationsEx.vb
@@ -33,10 +33,10 @@ Namespace Runtime
 				If t Is Nothing Then
 
 					Dim windir = Environment.GetEnvironmentVariable("windir")
-					Dim ostypeDirWine = "Z:\proc\sys\kernel\ostype"
-					Dim ostypeDirNative = "/proc/sys/kernel/ostype"
-					Dim systemVersionWine = "Z:\System\Library\CoreServices\SystemVersion.plist"
-					Dim systemVersionNative = "/System/Library/CoreServices/SystemVersion.plist"
+					Const ostypeDirWine = "Z:\proc\sys\kernel\ostype"
+					Const ostypeDirNative = "/proc/sys/kernel/ostype"
+					Const systemVersionWine = "Z:\System\Library\CoreServices\SystemVersion.plist"
+					Const systemVersionNative = "/System/Library/CoreServices/SystemVersion.plist"
 
 					If File.Exists(ostypeDirWine) Then ' Linux using wine
 						Dim osTypeString As String = File.ReadAllText(ostypeDirWine)