diff --git a/t/t-migrate-export.sh b/t/t-migrate-export.sh
index 75e08fb36d..a88ad9fd84 100755
--- a/t/t-migrate-export.sh
+++ b/t/t-migrate-export.sh
@@ -455,7 +455,8 @@ begin_test "migrate export (--object-map)"
 
   setup_multiple_local_branches_tracked
 
-  output_dir=$(mktemp -d)
+  output_dir="$GIT_LFS_TEST_DIR/export-object-map-$(lfstest-genrandom --base64url 32)"
+  mkdir -p "$output_dir"
 
   git log --all --pretty='format:%H' > "${output_dir}/old_sha.txt"
   git lfs migrate export --everything --include="*" --object-map "${output_dir}/object-map.txt"
diff --git a/t/t-migrate-import.sh b/t/t-migrate-import.sh
index 8c4769631d..1170176152 100755
--- a/t/t-migrate-import.sh
+++ b/t/t-migrate-import.sh
@@ -935,7 +935,8 @@ begin_test "migrate import (--object-map)"
 
   setup_multiple_local_branches
 
-  output_dir=$(mktemp -d)
+  output_dir="$GIT_LFS_TEST_DIR/import-object-map-$(lfstest-genrandom --base64url 32)"
+  mkdir -p "$output_dir"
 
   git log --all --pretty='format:%H' > "${output_dir}/old_sha.txt"
   git lfs migrate import --everything --object-map "${output_dir}/object-map.txt"