diff --git a/app/models/auto_track_duration_site_setting.rb b/app/models/auto_track_duration_site_setting.rb
index ce4c7b68789..b40ff6e0eb7 100644
--- a/app/models/auto_track_duration_site_setting.rb
+++ b/app/models/auto_track_duration_site_setting.rb
@@ -3,6 +3,7 @@ require_dependency 'enum_site_setting'
 class AutoTrackDurationSiteSetting < EnumSiteSetting
 
   def self.valid_value?(val)
+    val.to_i.to_s == val.to_s &&
     values.any? { |v| v[:value] == val.to_i }
   end
 
diff --git a/app/models/digest_email_site_setting.rb b/app/models/digest_email_site_setting.rb
index 5d0d40635a2..5276fe3b3eb 100644
--- a/app/models/digest_email_site_setting.rb
+++ b/app/models/digest_email_site_setting.rb
@@ -3,6 +3,7 @@ require_dependency 'enum_site_setting'
 class DigestEmailSiteSetting < EnumSiteSetting
 
   def self.valid_value?(val)
+    val.to_i.to_s == val.to_s &&
     values.any? { |v| v[:value] == val.to_i }
   end
 
diff --git a/app/models/new_topic_duration_site_setting.rb b/app/models/new_topic_duration_site_setting.rb
index f04b9e67e5a..ccc091a8b66 100644
--- a/app/models/new_topic_duration_site_setting.rb
+++ b/app/models/new_topic_duration_site_setting.rb
@@ -3,6 +3,7 @@ require_dependency 'enum_site_setting'
 class NewTopicDurationSiteSetting < EnumSiteSetting
 
   def self.valid_value?(val)
+    val.to_i.to_s == val.to_s &&
     values.any? { |v| v[:value] == val.to_i }
   end
 
diff --git a/app/models/trust_level_setting.rb b/app/models/trust_level_setting.rb
index 4b3e5d42e66..9ea838ad826 100644
--- a/app/models/trust_level_setting.rb
+++ b/app/models/trust_level_setting.rb
@@ -3,6 +3,7 @@ require_dependency 'enum_site_setting'
 class TrustLevelSetting < EnumSiteSetting
 
   def self.valid_value?(val)
+    val.to_i.to_s == val.to_s &&
     valid_values.any? { |v| v == val.to_i }
   end