diff --git a/pkgs/applications/science/logic/isabelle/settings.patch b/pkgs/applications/science/logic/isabelle/settings.patch
index dc9c611d488..bf509a4bac4 100644
--- a/pkgs/applications/science/logic/isabelle/settings.patch
+++ b/pkgs/applications/science/logic/isabelle/settings.patch
@@ -1,34 +1,32 @@
-diff -Naur Isabelle2009-1/etc/settings Isabelle2009-1-patched/etc/settings
---- Isabelle2009-1/etc/settings	2009-12-02 12:04:07.000000000 +0100
-+++ Isabelle2009-1-patched/etc/settings	2009-12-04 16:15:40.000000000 +0100
-@@ -16,15 +16,8 @@
- # Only one of the sections below should be activated.
+diff -Nuar Isabelle2011/etc/settings Isabelle2011-fix/etc/settings
+--- Isabelle2011/etc/settings	2011-01-30 13:02:18.000000000 +0100
++++ Isabelle2011-fix/etc/settings	2011-05-14 22:56:04.000000000 +0200
+@@ -17,13 +17,7 @@
  
  # Poly/ML 5.x (automated settings)
--POLY_HOME="$(type -p poly)"; [ -n "$POLY_HOME" ] && POLY_HOME="$(dirname "$POLY_HOME")"
  ML_PLATFORM="$ISABELLE_PLATFORM"
--ML_HOME=$(choosefrom \
+-ML_HOME="$(choosefrom \
 -  "$ISABELLE_HOME/contrib/polyml/$ML_PLATFORM" \
 -  "$ISABELLE_HOME/../polyml/$ML_PLATFORM" \
 -  "/usr/local/polyml/$ML_PLATFORM" \
 -  "/usr/share/polyml/$ML_PLATFORM" \
 -  "/opt/polyml/$ML_PLATFORM" \
--  $POLY_HOME)
+-  "")"
 +ML_HOME=@ML_HOME@
  ML_SYSTEM=$("$ISABELLE_HOME/lib/scripts/polyml-version")
  ML_OPTIONS="-H 200"
  ML_SOURCES="$ML_HOME/../src"
-@@ -185,13 +178,7 @@
+@@ -175,13 +169,7 @@
  ###
  
  # Proof General home, look in a variety of places
--PROOFGENERAL_HOME=$(choosefrom \
+-PROOFGENERAL_HOME="$(choosefrom \
 -  "$ISABELLE_HOME/contrib/ProofGeneral" \
 -  "$ISABELLE_HOME/../ProofGeneral" \
 -  "/usr/local/ProofGeneral" \
 -  "/usr/share/ProofGeneral" \
 -  "/opt/ProofGeneral" \
--  "")
+-  "")"
 +PROOFGENERAL_HOME=@PROOFGENERAL_HOME@
  
  PROOFGENERAL_OPTIONS=""