diff --git a/siunitx-PTB.sty b/siunitx-PTB.sty
index 74d415e9bbc60084e4e33b009fd30cf55ac423da..0d36a8cf56141b329ca82c3538367ed559e784a7 100644
--- a/siunitx-PTB.sty
+++ b/siunitx-PTB.sty
@@ -51,6 +51,7 @@
   ,math-celsius = \textdegree\text{C}
   ,text-celsius = \textdegree\text{C}
   ,detect-weight=true, detect-family=true
+  ,list-units=brackets
 }%     
 
 %%%}