diff --git a/read-file/action.py b/read-file/action.py
index 3d1ff70..4c1a64b 100644
--- a/read-file/action.py
+++ b/read-file/action.py
@@ -23,15 +23,13 @@ def parse_args() -> Namespace:
         help="Local path or remote URL to the file to read.",
     )
     parser.add_argument(
-        "parser",
+        "--parser",
         choices=["json", "yaml"],
-        nargs="?",
         help="Parser to use for the file.",
     )
     parser.add_argument(
-        "default",
+        "--default",
         type=str,
-        nargs="?",
         help="Default value to use if the file is not found.",
     )
     return parser.parse_args()
diff --git a/read-file/action.yml b/read-file/action.yml
index 491b236..155806f 100644
--- a/read-file/action.yml
+++ b/read-file/action.yml
@@ -48,6 +48,10 @@ runs:
     - name: Read JSON
       id: read
       shell: bash
-      run: python ${{ github.action_path }}/action.py ${{ inputs.path }} ${{ inputs.parser }} ${{ inputs.default }}
+      run: >
+        python ${{ github.action_path }}/action.py
+        ${{ inputs.path }}
+        ${{ inputs.parser && format('"--parser={0}"', input.parser) || '' }}
+        ${{ inputs.default && format('"--default={0}"', input.default) || '' }}
       env:
         GITHUB_TOKEN: ${{ github.token }}