diff --git a/src/main/java/org/apache/commons/lang3/time/FastDateParser.java b/src/main/java/org/apache/commons/lang3/time/FastDateParser.java
index a7d2963e5..f46946ff2 100644
--- a/src/main/java/org/apache/commons/lang3/time/FastDateParser.java
+++ b/src/main/java/org/apache/commons/lang3/time/FastDateParser.java
@@ -620,7 +620,7 @@ private static class TextStrategy extends Strategy {
          */
         @Override
         boolean addRegex(final FastDateParser parser, final StringBuilder regex) {
-            regex.append("((?i)(?u)");
+            regex.append("((?iu)");
             for(final String textKeyValue : keyValues.keySet()) {
                 escapeRegex(regex, textKeyValue, false).append('|');
             }