diff --git a/t/t7501-commit.sh b/t/t7501-commit.sh
index 6bd3c9e3e0..cfa67227e5 100644
--- a/t/t7501-commit.sh
+++ b/t/t7501-commit.sh
@@ -69,7 +69,8 @@ test_expect_success \
 
 cat >editor <<\EOF
 #!/bin/sh
-sed -i -e "s/a file/an amend commit/g" $1
+sed -e "s/a file/an amend commit/g" $1 > $1.new
+mv $1.new $1
 EOF
 chmod 755 editor
 
@@ -88,7 +89,8 @@ test_expect_success \
 
 cat >editor <<\EOF
 #!/bin/sh
-sed -i -e "s/amend/older/g" $1
+sed -e "s/amend/older/g" $1 > $1.new
+mv $1.new $1
 EOF
 chmod 755 editor