--- a/src/HOL/ex/SOS_Cert.thy	Fri Aug 18 13:55:05 2017 +0200
+++ b/src/HOL/ex/SOS_Cert.thy	Fri Aug 18 20:47:47 2017 +0200
@@ -6,7 +6,7 @@
 *)
 
 theory SOS_Cert
-imports "~~/src/HOL/Library/Sum_of_Squares"
+imports "HOL-Library.Sum_of_Squares"
 begin
 
 lemma "(3::real) * x + 7 * a < 4 \<and> 3 < 2 * x \<Longrightarrow> a < 0"