diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index dfe8af4335..e0c859cc8f 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -3150,9 +3150,22 @@ function wp_check_filetype_and_ext( $file, $filename, $mimes = null ) {
 		$real_mime = finfo_file( $finfo, $file );
 		finfo_close( $finfo );
 
-		// finfo_file() returns redudant mime type for Google docs, see #57898.
-		if ( 'application/vnd.openxmlformats-officedocument.wordprocessingml.documentapplication/vnd.openxmlformats-officedocument.wordprocessingml.document' === $real_mime ) {
-			$real_mime = 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';
+		$google_docs_types = array(
+			'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+			'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+		);
+
+		foreach ( $google_docs_types as $google_docs_type ) {
+			/*
+			 * finfo_file() can return duplicate mime type for Google docs,
+			 * this conditional reduces it to a single instance.
+			 *
+			 * @see https://bugs.php.net/bug.php?id=77784
+			 * @see https://core.trac.wordpress.org/ticket/57898
+			 */
+			if ( 2 === substr_count( $real_mime, $google_docs_type ) ) {
+				$real_mime = $google_docs_type;
+			}
 		}
 
 		// fileinfo often misidentifies obscure files as one of these types.
diff --git a/tests/phpunit/data/uploads/double-mime-type.docx b/tests/phpunit/data/uploads/double-mime-type.docx
new file mode 100644
index 0000000000..44988f24da
Binary files /dev/null and b/tests/phpunit/data/uploads/double-mime-type.docx differ
diff --git a/tests/phpunit/tests/functions.php b/tests/phpunit/tests/functions.php
index 32fa2bd1e6..1451117b91 100644
--- a/tests/phpunit/tests/functions.php
+++ b/tests/phpunit/tests/functions.php
@@ -1643,6 +1643,16 @@ class Tests_Functions extends WP_UnitTestCase {
 							'proper_filename' => false,
 						),
 					),
+					// Google Docs file for which finfo_file() returns a duplicate mime type.
+					array(
+						DIR_TESTDATA . '/uploads/double-mime-type.docx',
+						'double-mime-type.docx',
+						array(
+							'ext'             => 'docx',
+							'type'            => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+							'proper_filename' => false,
+						),
+					),
 					// Non-image file with wrong sub-type.
 					array(
 						DIR_TESTDATA . '/uploads/pages-to-word.docx',