diff --git a/ChangeLog.d/fix-ilp32.txt b/ChangeLog.d/fix-ilp32.txt
new file mode 100644
index 0000000000..7c28d68f43
--- /dev/null
+++ b/ChangeLog.d/fix-ilp32.txt
@@ -0,0 +1,4 @@
+Bugfix
+   * Fix a compile failure in the constant_time module when building
+     for watchos (i.e. for Aarch64 ILP32). Reported by Paulo Coutinho
+     in #7787.