diff --git a/style/mu/phil.dtx b/style/mu/phil.dtx
index c6b7ecf20345e70ae4e10c09b46b34575784fa3e..3b8dd23f0f00d42356fd23a0b641f6e3c9d323bb 100644
--- a/style/mu/phil.dtx
+++ b/style/mu/phil.dtx
@@ -22,7 +22,7 @@
 % used and the bibliography is sorted by name, title, and year.
 %    \begin{macrocode}
 \thesis@bibliography@setup{
-  style=iso-numeric,
+  style=iso-authoryear,
   sorting=nty}
 \thesis@bibliography@load
 %    \end{macrocode}