diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 27fbeb5..4b173a0 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -10,7 +10,7 @@ jobs:
   test:
     strategy:
       matrix:
-        platform: [ubuntu-20.04, ubuntu-18.04, macos-11, macos-10.15]
+        platform: [ubuntu-20.04, macos-11]
     runs-on: ${{ matrix.platform }}
     steps:
     - uses: actions/checkout@v2
diff --git a/todo.sh b/todo.sh
index ca624ad..9f20299 100755
--- a/todo.sh
+++ b/todo.sh
@@ -500,7 +500,8 @@ replaceOrPrepend()
 fixMissingEndOfLine()
 {
     # Parameters:    $1: todo file; empty means $TODO_FILE.
-    sed -i.bak -e '$a\' "${1:-$TODO_FILE}"
+    todo_path="${1:-$TODO_FILE}"
+    [[ -f $todo_path && $(tail -c1 "$todo_path") ]] && echo "" >> "$todo_path"    
 }
 
 uppercasePriority()