diff -r d80b2df54d31 -r a96320074298 src/HOL/Real.thy
--- a/src/HOL/Real.thy	Sun Jan 06 13:44:33 2019 +0100
+++ b/src/HOL/Real.thy	Sun Jan 06 15:04:34 2019 +0100
@@ -1644,8 +1644,8 @@
 
 subsection \<open>Setup for SMT\<close>
 
-ML_file "Tools/SMT/smt_real.ML"
-ML_file "Tools/SMT/z3_real.ML"
+ML_file \<open>Tools/SMT/smt_real.ML\<close>
+ML_file \<open>Tools/SMT/z3_real.ML\<close>
 
 lemma [z3_rule]:
   "0 + x = x"
@@ -1660,6 +1660,6 @@
 
 subsection \<open>Setup for Argo\<close>
 
-ML_file "Tools/Argo/argo_real.ML"
+ML_file \<open>Tools/Argo/argo_real.ML\<close>
 
 end