diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index 3c30c65..ffee74d 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -1446,8 +1446,8 @@
 				'\s*<>?\s*',			// <, <>
 				'\s*>\s*',			// >
 				'\s+IS NULL',			// IS NULL
-                '\s+IS NOT NULL',        // IS NOT NULL
-                '\s+EXISTS',        // EXISTS
+				'\s+IS NOT NULL',	// IS NOT NULL
+				'\s+EXISTS',	// EXISTS
 				'\s+NOT EXISTS',		// NOT EXISTS
 				'\s+BETWEEN\s+\S+\s+AND\s+\S+',	// BETWEEN value AND value
 				'\s+IN\s*\([^\)]+\)',		// IN(list)