diff --git a/system/modules/Monitoring/dca/tl_monitoring.php b/system/modules/Monitoring/dca/tl_monitoring.php
index 4f5fd68..00f61be 100644
--- a/system/modules/Monitoring/dca/tl_monitoring.php
+++ b/system/modules/Monitoring/dca/tl_monitoring.php
@@ -254,7 +254,7 @@
       'default'                 => '0',
       'inputType'               => 'text',
       'eval'                    => array('tl_class'=>'w50', 'readonly'=>true, 'rgxp'=>'digit', 'doNotCopy'=>true),
-      'sql'                     => "double unsigned NOT NULL default '0'"
+      'sql'                     => "double NOT NULL default '0'" // see doctrine/dbal#1018
     ),
     'disable' => array
     (
diff --git a/system/modules/Monitoring/dca/tl_monitoring_test.php b/system/modules/Monitoring/dca/tl_monitoring_test.php
index c1adbe6..fb00252 100644
--- a/system/modules/Monitoring/dca/tl_monitoring_test.php
+++ b/system/modules/Monitoring/dca/tl_monitoring_test.php
@@ -170,7 +170,7 @@
       'sorting'                 => true,
       'inputType'               => 'text',
       'eval'                    => array('tl_class'=>'w50', 'readonly'=>true, 'rgxp'=>'digit'),
-      'sql'                     => "double unsigned NOT NULL default '0'"
+      'sql'                     => "double NOT NULL default '0'" // see doctrine/dbal#1018
     ),
     'repetitions' => array
     (