diff --git a/buildout/instance-profiles/zope.cfg b/buildout/instance-profiles/zope.cfg
index 2d03910566f2cab7a4cbeb4c53b33cf0347f4791..06c2e38f7c01fe719ea489b2042bb8f96247972e 100644
--- a/buildout/instance-profiles/zope.cfg
+++ b/buildout/instance-profiles/zope.cfg
@@ -22,7 +22,7 @@ force-zodb-update = false
 # User modifable keys:
 environment =
   <environment>
-    PATH ${software_definition:software_home}/parts/imagemagick/bin:${software_definition:software_home}/parts/w3m/bin:${software_definition:software_home}/parts/xpdf/bin:${software_definition:software_home}/parts/ghostscript/bin
+    PATH ${software_definition:software_home}/parts/imagemagick/bin:${software_definition:software_home}/parts/w3m/bin:${software_definition:software_home}/parts/xpdf/bin:${software_definition:software_home}/parts/ghostscript/bin:${software_definition:software_home}/parts/pdftk/bin
   </environment>
 debug-mode = off
 ip-address = 0.0.0.0