diff --git a/stack.yaml b/stack.yaml
index 12605a9c99..fb26dde3d0 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -71,7 +71,6 @@ flags:
     pedantic: true
 
     ignore-plugins-ghc-bounds: true
-    alternateNumberFormat: false
     brittany: false
     haddockComments: false
     retrie: false