diff --git a/core/attributedef.class.inc.php b/core/attributedef.class.inc.php
index 0af669fe3..24ef91117 100644
--- a/core/attributedef.class.inc.php
+++ b/core/attributedef.class.inc.php
@@ -1214,7 +1214,7 @@ class AttributeDecimal extends AttributeDBField
 	public function MakeRealValue($proposedValue, $oHostObj)
 	{
 		if (is_null($proposedValue)) return null;
-		if ($proposedValue == '') return null;
+		if ($proposedValue === '') return null;
 		return (string)$proposedValue;
 	}