diff --git a/chromium_src/components/content_settings/core/browser/content_settings_registry.cc b/chromium_src/components/content_settings/core/browser/content_settings_registry.cc
index 1259aec10801..17ca8fa5c343 100644
--- a/chromium_src/components/content_settings/core/browser/content_settings_registry.cc
+++ b/chromium_src/components/content_settings/core/browser/content_settings_registry.cc
@@ -34,6 +34,22 @@
       ContentSettingsInfo::INHERIT_IN_INCOGNITO, \
       ContentSettingsInfo::EPHEMERAL, \
       ContentSettingsInfo::EXCEPTIONS_ON_SECURE_AND_INSECURE_ORIGINS); \
+  \
+  /* Disable background sync by default (brave/brave-browser#4709)*/ \
+  content_settings_info_.erase(CONTENT_SETTINGS_TYPE_BACKGROUND_SYNC); \
+  website_settings_registry_->UnRegister( \
+      CONTENT_SETTINGS_TYPE_BACKGROUND_SYNC); \
+  Register( \
+      CONTENT_SETTINGS_TYPE_BACKGROUND_SYNC, "background-sync", \
+      CONTENT_SETTING_BLOCK, WebsiteSettingsInfo::UNSYNCABLE, \
+      WhitelistedSchemes(), \
+      ValidSettings(CONTENT_SETTING_ALLOW, CONTENT_SETTING_BLOCK), \
+      WebsiteSettingsInfo::SINGLE_ORIGIN_ONLY_SCOPE, \
+      WebsiteSettingsRegistry::DESKTOP | \
+          WebsiteSettingsRegistry::PLATFORM_ANDROID, \
+      ContentSettingsInfo::INHERIT_IN_INCOGNITO, \
+      ContentSettingsInfo::PERSISTENT, \
+      ContentSettingsInfo::EXCEPTIONS_ON_SECURE_ORIGINS_ONLY); \
 }
 
 #include "../../../../../../components/content_settings/core/browser/content_settings_registry.cc"