diff --git a/test/formatters/apheleia-ft.el b/test/formatters/apheleia-ft.el
index 00ed504..feee83d 100755
--- a/test/formatters/apheleia-ft.el
+++ b/test/formatters/apheleia-ft.el
@@ -412,6 +412,8 @@ returned context."
                    formatter display-fname)))
         (princ (format
                 "[format-test] success: formatter %s (file %s)\n"
-                formatter display-fname))))))
+                formatter display-fname))
+        ;; https://stackoverflow.com/a/66558297
+        (set-binary-mode 'stdout nil)))))
 
 (provide 'apheleia-ft)
diff --git a/test/shared/run-func.bash b/test/shared/run-func.bash
index d539409..db6c689 100755
--- a/test/shared/run-func.bash
+++ b/test/shared/run-func.bash
@@ -14,4 +14,4 @@ exec emacs --batch -L . "$@"                  \
      --eval "(setq debug-on-error t)"         \
      --eval "(setq backtrace-line-length 0)"  \
      -f     "${func}"                         \
-     2>&1 | sed -E 's/^(.{640}).+$/\1...[truncated]/'
+     2>&1 | sed -uE 's/^(.{640}).+$/\1...[truncated]/'