diff --git a/_extensions/rostools/r3-theme/_extension.yml b/_extensions/rostools/r3-theme/_extension.yml
index 544e82b..489dd6b 100644
--- a/_extensions/rostools/r3-theme/_extension.yml
+++ b/_extensions/rostools/r3-theme/_extension.yml
@@ -51,7 +51,6 @@ contributes:
 
     csl: vancouver.csl
 
-    callout-appearance: minimal
     reference-location: margin
     citation-location: margin
     crossref: