diff --git a/pygraphviz/agraph.py b/pygraphviz/agraph.py
index 8f72024..2d8358e 100644
--- a/pygraphviz/agraph.py
+++ b/pygraphviz/agraph.py
@@ -1557,7 +1557,7 @@ class AGraph(object):
         import os
         import glob
 
-        paths = os.environ["PATH"]
+        paths = '@graphviz@/bin:' + os.environ["PATH"]
         if os.name == "nt":
             exe = ".exe"
         else: