diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9d0d67b..2f4f658 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -32,8 +32,11 @@ The format is based on [Keep a Changelog].
 * `mix format` is now passed the `--stdin-filename` argument which is
   required in some cases. The version of Mix is autodetected and this
   option is only passed when it is supported ([#319]).
+* `mix format` is now run with `MIX_QUIET` to supress compilation
+  output ([#326])
 * Beancount files are formatted without an error ([#309]).
 
+
 ## Internal
 * Improvements to formatter test framework, it is now possible to
   write tests that have additional data files ([#301]).
diff --git a/scripts/formatters/apheleia-mix-format b/scripts/formatters/apheleia-mix-format
index a93bea0..21531d7 100755
--- a/scripts/formatters/apheleia-mix-format
+++ b/scripts/formatters/apheleia-mix-format
@@ -32,4 +32,4 @@ if [[ "${ver}" == "${higher_ver}" ]]; then
 fi
 args+=(-)
 
-exec "${args[@]}"
+MIX_QUIET=1 exec "${args[@]}"