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diff --git a/web/core/modules/content_moderation/content_moderation.install b/web/core/modules/content_moderation/content_moderation.install
index e33a35973..ddeecb562 100644
--- a/web/core/modules/content_moderation/content_moderation.install
+++ b/web/core/modules/content_moderation/content_moderation.install
@@ -5,6 +5,21 @@
  * Install, update and uninstall functions for the Content Moderation module.
  */
 
+/**
+ * Implements hook_requirements().
+ */
+function content_moderation_requirements($phase) {
+  $requirements = [];
+  if ($phase === 'install' && \Drupal::moduleHandler()->moduleExists('workspaces')) {
+    $requirements['workspaces_incompatibility'] = [
+      'severity' => REQUIREMENT_ERROR,
+      'description' => t('Content Moderation can not be installed when Workspaces is also installed.'),
+    ];
+  }
+
+  return $requirements;
+}
+
 /**
  * Remove the 'content_revision_tracker' table.
  */