diff --git a/.github/workflows/arm-build.yml b/.github/workflows/arm-build.yml
index 6888ddc48..d1a465e0b 100644
--- a/.github/workflows/arm-build.yml
+++ b/.github/workflows/arm-build.yml
@@ -5,7 +5,7 @@ on:
     branches:
       - arm-build
   schedule:
-    - cron:  '0 4 * 20 *' # 20th at 4:00 UTC
+    - cron:  '0 4 20 * *' # 20th at 4:00 UTC
 
 jobs:
   Build:
diff --git a/.github/workflows/coverity-scan.yml b/.github/workflows/coverity-scan.yml
index aa43b6e8c..90fb3f79e 100644
--- a/.github/workflows/coverity-scan.yml
+++ b/.github/workflows/coverity-scan.yml
@@ -5,7 +5,7 @@ on:
     branches:
       - coverity_scan
   schedule:
-   - cron:  '0 6 * 20 *' # 20th at 6:00 UTC
+   - cron:  '0 6 20 * *' # 20th at 6:00 UTC
 
 jobs:
   Coverity: