diff --git a/internal/dis/component/stack.go b/internal/dis/component/stack.go
index f3b45d3..c6bc0b1 100644
--- a/internal/dis/component/stack.go
+++ b/internal/dis/component/stack.go
@@ -77,8 +77,8 @@ func (ds Stack) Up(ctx context.Context, progress io.Writer) error {
 // It returns the exit code of the process.
 func (ds Stack) Exec(ctx context.Context, io stream.IOStream, service, executable string, args ...string) func() int {
 	compose := []string{"exec"}
-	if io.StdinIsATerminal() {
-		compose = append(compose, "-ti")
+	if !io.StdinIsATerminal() {
+		compose = append(compose, "-T")
 	}
 
 	compose = append(compose, service)
diff --git a/internal/wisski/ingredient/barrel/drush/update.go b/internal/wisski/ingredient/barrel/drush/update.go
index 20b5c2b..fdd1b53 100644
--- a/internal/wisski/ingredient/barrel/drush/update.go
+++ b/internal/wisski/ingredient/barrel/drush/update.go
@@ -14,7 +14,7 @@ import (
 )
 
 var errBlindUpdateFailed = exit.Error{
-	Message:  "failed to run blind update script for instance %q: exited with code %s",
+	Message:  "failed to run blind update script for instance %q: exited with code %d",
 	ExitCode: exit.ExitGeneric,
 }