diff --git a/wp-includes/class-wp-rewrite.php b/wp-includes/class-wp-rewrite.php
index 035bbc3866..e6f768fed1 100644
--- a/wp-includes/class-wp-rewrite.php
+++ b/wp-includes/class-wp-rewrite.php
@@ -1744,6 +1744,18 @@ class WP_Rewrite {
 		$this->extra_permastructs[ $name ] = $args;
 	}
 
+	/**
+	 * Removes a permalink structure.
+	 *
+	 * @since 4.5.0
+	 * @access public
+	 *
+	 * @param string $name Name for permalink structure.
+	 */
+	public function remove_permastruct( $name ) {
+		unset( $this->extra_permastructs[ $name ] );
+	}
+
 	/**
 	 * Removes rewrite rules and then recreate rewrite rules.
 	 *
diff --git a/wp-includes/rewrite.php b/wp-includes/rewrite.php
index 7f3b2ed321..fe6b99adb7 100644
--- a/wp-includes/rewrite.php
+++ b/wp-includes/rewrite.php
@@ -178,7 +178,7 @@ function add_rewrite_tag( $tag, $regex, $query = '' ) {
  * @since 3.0.0
  *
  * @see WP_Rewrite::add_permastruct()
- * @global WP_Rewrite $wp_rewrite
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
  *
  * @param string $name   Name for permalink structure.
  * @param string $struct Permalink structure.
@@ -197,6 +197,25 @@ function add_permastruct( $name, $struct, $args = array() ) {
 	$wp_rewrite->add_permastruct( $name, $struct, $args );
 }
 
+/**
+ * Remove permalink structure.
+ *
+ * Can only be used to remove permastructs that were added using add_permastruct().
+ * Built-in permastructs cannot be removed.
+ *
+ * @since 4.5.0
+ *
+ * @see WP_Rewrite::remove_permastruct()
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
+ *
+ * @param string $name Name for permalink structure.
+ */
+function remove_permastruct( $name ) {
+	global $wp_rewrite;
+
+	$wp_rewrite->remove_permastruct( $name );
+}
+
 /**
  * Add a new feed type like /atom1/.
  *
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 3f193c31c0..52e7d1956a 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-alpha-36180';
+$wp_version = '4.5-alpha-36181';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.