diff --git a/src/wp-includes/wp-db.php b/src/wp-includes/wp-db.php
index 7a09d62a9e..7366172101 100644
--- a/src/wp-includes/wp-db.php
+++ b/src/wp-includes/wp-db.php
@@ -1785,7 +1785,9 @@ class wpdb {
 			$wheres[] = "`$field` = {$form}";
 		}
 
-		$sql = "UPDATE `$table` SET " . implode( ', ', $bits ) . ' WHERE ' . implode( ' AND ', $wheres );
+		$wheres = empty( $where ) ? '' : ( ' WHERE ' . implode( ' AND ', $wheres ) );
+
+		$sql = "UPDATE `$table` SET " . implode( ', ', $bits ) . $wheres;
 		return $this->query( $this->prepare( $sql, array_merge( array_values( $data ), array_values( $where ) ) ) );
 	}
 
diff --git a/tests/phpunit/tests/db.php b/tests/phpunit/tests/db.php
index 39a1f11339..19db983075 100644
--- a/tests/phpunit/tests/db.php
+++ b/tests/phpunit/tests/db.php
@@ -436,4 +436,21 @@ class Tests_DB extends WP_UnitTestCase {
 		$row = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->users WHERE ID = %d", $last ) );
 		$this->assertEquals( 'Walter Replace Sobchak', $row->display_name );
 	}
+
+	/**
+	 *
+	 * @ticket 26106
+	 */
+	function test_empty_where() {
+		global $wpdb;
+		$wpdb->update( $wpdb->posts, array( 'post_name' => 'burrito' ), array() );
+
+		$expected1 = "UPDATE `{$wpdb->posts}` SET `post_name` = 'burrito'";
+		$this->assertEquals( $expected1, $wpdb->last_query );
+
+		$wpdb->update( $wpdb->posts, array( 'post_name' => 'burrito' ), array( 'post_status' => 'taco' ) );
+
+		$expected2 = "UPDATE `{$wpdb->posts}` SET `post_name` = 'burrito' WHERE `post_status` = 'taco'";
+		$this->assertEquals( $expected2, $wpdb->last_query );
+	}
 }