diff --git a/schema/mysql-changes/upgrade_29.sql b/schema/mysql-changes/upgrade_29.sql
index 2764bd4c..68470674 100644
--- a/schema/mysql-changes/upgrade_29.sql
+++ b/schema/mysql-changes/upgrade_29.sql
@@ -5,22 +5,12 @@ CREATE TABLE import_row_modifier (
   id INT(10) UNSIGNED AUTO_INCREMENT NOT NULL,
   property_id INT(10) UNSIGNED NOT NULL,
   provider_class VARCHAR(72) NOT NULL,
-  PRIMARY KEY (id),
-  CONSTRAINT sync_modifier_property
-    FOREIGN KEY sync_property (property_id)
-    REFERENCES sync_property (id)
-    ON DELETE CASCADE
-    ON UPDATE CASCADE
+  PRIMARY KEY (id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
 CREATE TABLE import_row_modifier_settings (
   modifier_id INT UNSIGNED NOT NULL,
   settings_name VARCHAR(64) NOT NULL,
   settings_value TEXT DEFAULT NULL,
-  PRIMARY KEY (modifier_id, settings_name),
-  CONSTRAINT sync_modifier_settings_modifier
-    FOREIGN KEY modifier (modifier_id)
-    REFERENCES sync_modifier (id)
-    ON DELETE CASCADE
-    ON UPDATE CASCADE
+  PRIMARY KEY (modifier_id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
diff --git a/schema/mysql-changes/upgrade_30.sql b/schema/mysql-changes/upgrade_30.sql
index 3df66dd3..1cd60b8f 100644
--- a/schema/mysql-changes/upgrade_30.sql
+++ b/schema/mysql-changes/upgrade_30.sql
@@ -4,10 +4,5 @@ CREATE TABLE import_row_modifier_setting (
   modifier_id INT UNSIGNED NOT NULL,
   setting_name VARCHAR(64) NOT NULL,
   setting_value TEXT DEFAULT NULL,
-  PRIMARY KEY (modifier_id, setting_name),
-  CONSTRAINT sync_modifier_param_modifier
-    FOREIGN KEY modifier (modifier_id)
-    REFERENCES sync_modifier (id)
-    ON DELETE CASCADE
-    ON UPDATE CASCADE
+  PRIMARY KEY (modifier_id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
diff --git a/schema/mysql.sql b/schema/mysql.sql
index d20c4fe7..cfae06d9 100644
--- a/schema/mysql.sql
+++ b/schema/mysql.sql
@@ -931,22 +931,12 @@ CREATE TABLE import_row_modifier (
   id INT(10) UNSIGNED AUTO_INCREMENT NOT NULL,
   property_id INT(10) UNSIGNED NOT NULL,
   provider_class VARCHAR(72) NOT NULL,
-  PRIMARY KEY (id),
-  CONSTRAINT sync_modifier_property
-    FOREIGN KEY sync_property (property_id)
-    REFERENCES sync_property (id)
-    ON DELETE CASCADE
-    ON UPDATE CASCADE
+  PRIMARY KEY (id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
 CREATE TABLE import_row_modifier_setting (
   modifier_id INT UNSIGNED NOT NULL,
   setting_name VARCHAR(64) NOT NULL,
   setting_value TEXT DEFAULT NULL,
-  PRIMARY KEY (modifier_id, param_name),
-  CONSTRAINT sync_modifier_param_modifier
-    FOREIGN KEY modifier (modifier_id)
-    REFERENCES sync_modifier (id)
-    ON DELETE CASCADE
-    ON UPDATE CASCADE
+  PRIMARY KEY (modifier_id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;