diff -r 757549b4bbe6 -r 8304fb4fb823 src/HOL/Tools/Meson/meson.ML
--- a/src/HOL/Tools/Meson/meson.ML	Wed Jul 08 19:28:43 2015 +0200
+++ b/src/HOL/Tools/Meson/meson.ML	Wed Jul 08 21:33:00 2015 +0200
@@ -709,7 +709,7 @@
             resolve_tac ctxt @{thms ccontr} 1,
             preskolem_tac,
             Subgoal.FOCUS (fn {context = ctxt', prems = negs, ...} =>
-                      EVERY1 [skolemize_prems_tac ctxt negs,
+                      EVERY1 [skolemize_prems_tac ctxt' negs,
                               Subgoal.FOCUS (cltac o mkcl o #prems) ctxt']) ctxt 1]) i st
   handle THM _ => no_tac st;    (*probably from make_meta_clause, not first-order*)