diff --git a/windows/security_windows.go b/windows/security_windows.go
index d88ed91a..4b6eff18 100644
--- a/windows/security_windows.go
+++ b/windows/security_windows.go
@@ -229,15 +229,13 @@ func LookupSID(system, account string) (sid *SID, domain string, accType uint32,
 
 // String converts SID to a string format suitable for display, storage, or transmission.
 func (sid *SID) String() string {
-	// From https://docs.microsoft.com/en-us/windows/win32/secbiomet/general-constants
-	const SecurityMaxSidSize = 68
 	var s *uint16
 	e := ConvertSidToStringSid(sid, &s)
 	if e != nil {
 		return ""
 	}
 	defer LocalFree((Handle)(unsafe.Pointer(s)))
-	return UTF16ToString((*[SecurityMaxSidSize]uint16)(unsafe.Pointer(s))[:])
+	return UTF16ToString((*[256]uint16)(unsafe.Pointer(s))[:])
 }
 
 // Len returns the length, in bytes, of a valid security identifier SID.