diff --git a/wfobj.py b/wfobj.py
index 0c6d878..65e5cdd 100755
--- a/wfobj.py
+++ b/wfobj.py
@@ -1,5 +1,6 @@
 
 import types
+import os
 
 class WFObj(object):
     def __init__(self, source, fileloader=None):
@@ -10,6 +11,7 @@ class WFObj(object):
         self.faces = {}
         self.materials = {}
         if type(source) == types.StringType:
+            self.source_path = source
             if self.fileloader is not None:
                 fh = self.fileloader(source)
                 self.load(fh)
@@ -18,6 +20,7 @@ class WFObj(object):
                 self.load(fh)
                 fh.close()
         else:
+            self.source_path = ''
             self.load(source)
 
     def load(self, fh):
@@ -106,6 +109,9 @@ class WFObj(object):
             self.shininess = 50
 
     def load_material_library(self, name):
+        dn = os.path.dirname(self.source_path)
+        if dn != '':
+            name = dn + os.path.sep + name
         if self.fileloader is not None:
             fh = self.fileloader(name)
         else: