diff --git a/mls.bib b/mls.bib
index f8419866f..a5de3e9e3 100644
--- a/mls.bib
+++ b/mls.bib
@@ -7,7 +7,7 @@ @Article{Pantelides1988ConsistentInitialization
   volume = {9},
   number = {2},
   pages = {213–-231},
-  url = {http://epubs.siam.org/doi/abs/10.1137/0909014},
+  url = {https://doi.org/10.1137/0909014},
 }
 
 @Article{BenvenisteEtAl2003SynchronousTwelveYearsLater,