diff --git a/dub.sdl b/dub.sdl
index d4be719..b618825 100644
--- a/dub.sdl
+++ b/dub.sdl
@@ -7,6 +7,7 @@
 
 targetPath "bin"
 
+dflags "-preview=in"
 // Deprecated module(s)
 excludedSourceFiles "source/dub/packagesupplier.d"
 
diff --git a/source/dub/internal/vibecompat/core/file.d b/source/dub/internal/vibecompat/core/file.d
index 64faf3b..e3fc1c1 100644
--- a/source/dub/internal/vibecompat/core/file.d
+++ b/source/dub/internal/vibecompat/core/file.d
@@ -101,7 +101,7 @@
 	copyFile(NativePath(from), NativePath(to));
 }
 
-version (Windows) extern(Windows) int CreateHardLinkW(in wchar* to, in wchar* from, void* attr=null);
+version (Windows) extern(Windows) int CreateHardLinkW(const(wchar)* to, const(wchar)* from, void* attr=null);
 
 // guess whether 2 files are identical, ignores filename and content
 private bool sameFile(NativePath a, NativePath b)