diff --git a/build-constraints.yaml b/build-constraints.yaml
index 399ad4a1..58652bfc 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -979,6 +979,13 @@ package-flags:
     cabal-debian:
         pretty-112: false
 
+    hledger:
+        old-locale: true
+    hledger-lib:
+        old-locale: true
+    hledger-web:
+        old-locale: true
+
 # By skipping a test suite, we do not pull in the build dependencies
 skipped-tests:
     - ReadArgs # old version of hspec