diff --git a/doc/doxygen/cantera.bib b/doc/doxygen/cantera.bib
index ea20e47f9..9855db3ea 100644
--- a/doc/doxygen/cantera.bib
+++ b/doc/doxygen/cantera.bib
@@ -364,8 +364,7 @@
     volume = {15},
     url = {https://dx.doi.org/10.1063/1.555763},
     year = {1986},
-    %doi = {10.1063/1.555763},
-    }
+    doi = {10.1063/1.555763}}
 @article{silvester1977,
     author = {L.~F.~Silvester and K.~S.~Pitzer},
     title = {Thermodynamics of electrolytes. 8. High-temperature properties, including