diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index c2f6089..9187e9b 100755
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -215,10 +215,10 @@
 # Run command with GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
 # GIT_AUTHOR_DATE exported from the current environment.
 do_with_author () {
-	GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
-	GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
-	GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
-	"$@"
+	(
+		export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
+		"$@"
+	)
 }
 
 pick_one () {