diff --git a/source/dub/internal/vibecompat/inet/path.d b/source/dub/internal/vibecompat/inet/path.d
index d449944..26cad1a 100644
--- a/source/dub/internal/vibecompat/inet/path.d
+++ b/source/dub/internal/vibecompat/inet/path.d
@@ -300,13 +300,6 @@
 	int opCmp(string rhs) const scope @safe pure nothrow @nogc { return m_name.cmp(rhs); }
 }
 
-private bool isValidFilename(string str)
-{
-	foreach( ch; str )
-		if( ch == '/' || /*ch == ':' ||*/ ch == '\\' ) return false;
-	return true;
-}
-
 /// Joins two path strings. subpath must be relative.
 string joinPath(string basepath, string subpath)
 {