diff --git a/src/wp-admin/includes/file.php b/src/wp-admin/includes/file.php
index 04dea32a20..993635e460 100644
--- a/src/wp-admin/includes/file.php
+++ b/src/wp-admin/includes/file.php
@@ -928,7 +928,7 @@ function _wp_handle_upload( &$file, $overrides, $time, $action ) {
 	$url = $uploads['url'] . "/$filename";
 
 	if ( is_multisite() ) {
-		invalidate_dirsize_cache( $new_file );
+		clean_dirsize_cache( $new_file );
 	}
 
 	/**
diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index 58a098f916..ccf89a449d 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -2747,7 +2747,7 @@ function wp_upload_bits( $name, $deprecated, $bits, $time = null ) {
 	$url = $upload['url'] . "/$filename";
 
 	if ( is_multisite() ) {
-		invalidate_dirsize_cache( $new_file );
+		clean_dirsize_cache( $new_file );
 	}
 
 	/** This filter is documented in wp-admin/includes/file.php */
@@ -7628,7 +7628,8 @@ function recurse_dirsize( $directory, $exclude = null, $max_execution_time = nul
 	$size = 0;
 
 	$directory  = untrailingslashit( $directory );
-	$cache_path = normalize_dirsize_cache_path( $directory );
+	$cache_path = untrailingslashit( str_replace( ABSPATH, '', $directory ) );
+
 	$save_cache = false;
 
 	if ( ! isset( $directory_cache ) ) {
@@ -7722,14 +7723,14 @@ function recurse_dirsize( $directory, $exclude = null, $max_execution_time = nul
  *
  * @param string $path Full path of a directory or file.
  */
-function invalidate_dirsize_cache( $path ) {
+function clean_dirsize_cache( $path ) {
 	$directory_cache = get_transient( 'dirsize_cache' );
 
 	if ( empty( $directory_cache ) ) {
 		return;
 	}
 
-	$cache_path = normalize_dirsize_cache_path( $path );
+	$cache_path = untrailingslashit( str_replace( ABSPATH, '', $path ) );
 	unset( $directory_cache[ $cache_path ] );
 
 	while ( DIRECTORY_SEPARATOR !== $cache_path && '.' !== $cache_path && '..' !== $cache_path ) {
@@ -7740,22 +7741,6 @@ function invalidate_dirsize_cache( $path ) {
 	set_transient( 'dirsize_cache', $directory_cache );
 }
 
-/**
- * Normalize dirsize cache path.
- *
- * Ensures array keys within the dirsize_cache transient follow the same format.
- *
- * @since 5.6.0
- *
- * @param string $path
- * @return string
- */
-function normalize_dirsize_cache_path( $path ) {
-	$path = str_replace( ABSPATH, '', $path );
-
-	return untrailingslashit( $path );
-}
-
 /**
  * Checks compatibility with the current WordPress version.
  *
diff --git a/src/wp-includes/post.php b/src/wp-includes/post.php
index 2e1afdbf4a..7db2c44899 100644
--- a/src/wp-includes/post.php
+++ b/src/wp-includes/post.php
@@ -5918,7 +5918,7 @@ function wp_delete_attachment( $post_id, $force_delete = false ) {
 	$file         = get_attached_file( $post_id );
 
 	if ( is_multisite() ) {
-		invalidate_dirsize_cache( $file );
+		clean_dirsize_cache( $file );
 	}
 
 	/**
diff --git a/tests/phpunit/tests/multisite/dirsizeCache.php b/tests/phpunit/tests/multisite/cleanDirsizeCache.php
similarity index 94%
rename from tests/phpunit/tests/multisite/dirsizeCache.php
rename to tests/phpunit/tests/multisite/cleanDirsizeCache.php
index c9bdb83c00..816eba4393 100644
--- a/tests/phpunit/tests/multisite/dirsizeCache.php
+++ b/tests/phpunit/tests/multisite/cleanDirsizeCache.php
@@ -71,7 +71,7 @@ if ( is_multisite() ) :
 		 * Test whether the invalidation of the dirsize_cache works
 		 * Given a file path as input
 		 */
-		function test_invalidate_dirsize_cache_file_input_mock() {
+		function test_clean_dirsize_cache_file_input_mock() {
 			$blog_id = self::factory()->blog->create();
 			switch_to_blog( $blog_id );
 
@@ -85,7 +85,7 @@ if ( is_multisite() ) :
 			}
 
 			$upload_dir       = wp_upload_dir();
-			$cache_key_prefix = normalize_dirsize_cache_path( $upload_dir['basedir'] );
+			$cache_key_prefix = untrailingslashit( str_replace( ABSPATH, '', $upload_dir['basedir'] ) );
 
 			// Clear the dirsize_cache
 			delete_transient( 'dirsize_cache' );
@@ -99,7 +99,7 @@ if ( is_multisite() ) :
 
 			// Invalidation should also respect the directory tree up
 			// Should work fine with path to folder OR file
-			invalidate_dirsize_cache( $upload_dir['basedir'] . '/2/1/file.dummy' );
+			clean_dirsize_cache( $upload_dir['basedir'] . '/2/1/file.dummy' );
 
 			$this->assertSame( false, array_key_exists( $cache_key_prefix . '/2/1', get_transient( 'dirsize_cache' ) ) );
 			$this->assertSame( false, array_key_exists( $cache_key_prefix . '/2', get_transient( 'dirsize_cache' ) ) );
@@ -116,7 +116,7 @@ if ( is_multisite() ) :
 		 * Test whether the invalidation of the dirsize_cache works
 		 * Given a folder path as input
 		 */
-		function test_invalidate_dirsize_cache_folder_input_mock() {
+		function test_clean_dirsize_cache_folder_input_mock() {
 			$blog_id = self::factory()->blog->create();
 			switch_to_blog( $blog_id );
 
@@ -130,7 +130,7 @@ if ( is_multisite() ) :
 			}
 
 			$upload_dir       = wp_upload_dir();
-			$cache_key_prefix = normalize_dirsize_cache_path( $upload_dir['basedir'] );
+			$cache_key_prefix = untrailingslashit( str_replace( ABSPATH, '', $upload_dir['basedir'] ) );
 
 			// Clear the dirsize_cache
 			delete_transient( 'dirsize_cache' );
@@ -144,7 +144,7 @@ if ( is_multisite() ) :
 
 			// Invalidation should also respect the directory tree up
 			// Should work fine with path to folder OR file
-			invalidate_dirsize_cache( $upload_dir['basedir'] . '/2/1' );
+			clean_dirsize_cache( $upload_dir['basedir'] . '/2/1' );
 
 			$this->assertSame( false, array_key_exists( $cache_key_prefix . '/2/1', get_transient( 'dirsize_cache' ) ) );
 			$this->assertSame( false, array_key_exists( $cache_key_prefix . '/2', get_transient( 'dirsize_cache' ) ) );
@@ -190,7 +190,7 @@ if ( is_multisite() ) :
 			$this->assertSame( $size, $calc_size );
 
 			// dirsize_cache should now be filled after upload and recurse_dirsize call
-			$cache_path = normalize_dirsize_cache_path( $upload_dir['path'] );
+			$cache_path = untrailingslashit( str_replace( ABSPATH, '', $upload_dir['path'] ) );
 			$this->assertSame( true, is_array( get_transient( 'dirsize_cache' ) ) );
 			$this->assertSame( $size, get_transient( 'dirsize_cache' )[ $cache_path ] );