diff --git a/src/main/java/org/apache/commons/lang3/StringUtils.java b/src/main/java/org/apache/commons/lang3/StringUtils.java
index a0f83a159..5f167b938 100644
--- a/src/main/java/org/apache/commons/lang3/StringUtils.java
+++ b/src/main/java/org/apache/commons/lang3/StringUtils.java
@@ -6148,7 +6148,7 @@ public class StringUtils {
         }
         final int sz = cs.length();
         for (int i = 0; i < sz; i++) {
-            if (Character.isDigit(cs.charAt(i)) == false) {
+            if (!Character.isDigit(cs.charAt(i))) {
                 return false;
             }
         }