diff --git a/commons-fileupload2-core/src/main/java/org/apache/commons/fileupload2/core/MimeUtils.java b/commons-fileupload2-core/src/main/java/org/apache/commons/fileupload2/core/MimeUtils.java
index 667386b393..d8dce3c966 100644
--- a/commons-fileupload2-core/src/main/java/org/apache/commons/fileupload2/core/MimeUtils.java
+++ b/commons-fileupload2-core/src/main/java/org/apache/commons/fileupload2/core/MimeUtils.java
@@ -70,8 +70,8 @@ final class MimeUtils {
         MIME2JAVA.put("ja_jp.eucjp", "EUCJIS");
         MIME2JAVA.put("euc-kr", "KSC5601");
         MIME2JAVA.put("euckr", "KSC5601");
-        MIME2JAVA.put("us-ascii", "ISO-8859-1");
-        MIME2JAVA.put("x-us-ascii", "ISO-8859-1");
+        MIME2JAVA.put("us-ascii", StandardCharsets.ISO_8859_1.name());
+        MIME2JAVA.put("x-us-ascii", StandardCharsets.ISO_8859_1.name());
     }
 
     /**