diff --git a/laspy/header.py b/laspy/header.py
index 34e64b1f..d634447e 100644
--- a/laspy/header.py
+++ b/laspy/header.py
@@ -464,21 +464,22 @@ def __len__(self):
         '''Return the size of the vlr object in bytes'''
         return self.rec_len_after_header + 54
 
-    def pack(self, name, val): 
-        '''Pack a VLR field into bytes.'''
+    def pack(self, name, val):
         spec = self.fmt.lookup[name]
+        if type(val)== bytes:
+            return val
         if spec.num == 1:
             return(struct.pack(spec.fmt, val))
-        return(struct.pack(spec.fmt[0]+spec.fmt[1]*len(val), *val))
+        return(struct.pack(spec.fmt[0]+spec.fmt[1]*len(val)))
     
     def to_byte_string(self):
         '''Pack the entire VLR into a byte string.'''
         if type(self.parsed_body) != type(None):
             self.pack_data()
-        out = (self.pack("reserved", self.reserved) + 
-               self.pack("user_id", self.user_id) + 
-               self.pack("record_id", self.record_id) + 
-               self.pack("rec_len_after_header", self.rec_len_after_header) + 
+        out = (self.pack("reserved", self.reserved) +
+               self.pack("user_id", self.user_id) +
+               self.pack("record_id", self.record_id) +
+               self.pack("rec_len_after_header", self.rec_len_after_header) +
                self.pack("description", self.description) +
                self.VLR_body)
         diff = (self.rec_len_after_header - len(self.VLR_body))