diff --git a/.github/workflows/GH-820-graceperiod.yml b/.github/workflows/GH-820-graceperiod.yml
index 24957940..21e9b781 100644
--- a/.github/workflows/GH-820-graceperiod.yml
+++ b/.github/workflows/GH-820-graceperiod.yml
@@ -51,7 +51,7 @@ jobs:
       - uses: ./
         with:
           retry-method: 'equal_intervals'
-          wait-seconds-before-first-polling: '0'
+          wait-seconds-before-first-polling: '1'
           min-interval-seconds: '5'
           attempt-limits: '100'
           wait-list: |
@@ -77,7 +77,7 @@ jobs:
       - uses: ./
         with:
           retry-method: 'equal_intervals'
-          wait-seconds-before-first-polling: '0'
+          wait-seconds-before-first-polling: '1'
           min-interval-seconds: '5'
           attempt-limits: '100'
           wait-list: |
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b635088e..1bf099e1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ This file only records notable changes. Not synchronized with all releases and t
 
 - main - not yet released
   - Add `startupGracePeriod` option in wait-list: [#820](https://github.com/kachick/wait-other-jobs/issues/820)
+  - Restrict `wait-seconds-before-first-polling` if it is too short as zero or shorter than `startupGracePeriod`
 - v3.2.0
   - Add `eventName` option in wait-list: [#771](https://github.com/kachick/wait-other-jobs/issues/771)
 - v3.1.0