diff --git a/wp-includes/wp-db.php b/wp-includes/wp-db.php
index 3dc9411bfc..76f766a1dd 100644
--- a/wp-includes/wp-db.php
+++ b/wp-includes/wp-db.php
@@ -1106,12 +1106,12 @@ class wpdb {
 			return false;
 		}
 
-		if ( preg_match( '/^\s*(create|alter|truncate|drop) /i', $query ) ) {
+		if ( preg_match( '/^\s*(create|alter|truncate|drop)\s/i', $query ) ) {
 			$return_val = $this->result;
-		} elseif ( preg_match( '/^\s*(insert|delete|update|replace) /i', $query ) ) {
+		} elseif ( preg_match( '/^\s*(insert|delete|update|replace)\s/i', $query ) ) {
 			$this->rows_affected = mysql_affected_rows( $this->dbh );
 			// Take note of the insert_id
-			if ( preg_match( '/^\s*(insert|replace) /i', $query ) ) {
+			if ( preg_match( '/^\s*(insert|replace)\s/i', $query ) ) {
 				$this->insert_id = mysql_insert_id($this->dbh);
 			}
 			// Return number of rows affected