diff --git a/src/java.base/share/classes/java/lang/ThreadBuilders.java b/src/java.base/share/classes/java/lang/ThreadBuilders.java
index 62c29651d11ee..033c237877c06 100644
--- a/src/java.base/share/classes/java/lang/ThreadBuilders.java
+++ b/src/java.base/share/classes/java/lang/ThreadBuilders.java
@@ -309,7 +309,7 @@ UncaughtExceptionHandler uncaughtExceptionHandler() {
 
         String nextThreadName() {
             if (hasCounter) {
-                return name + (long) COUNT.getAndAdd(this, 1);
+                return name + (long) COUNT.getAndAdd(this, 1L);
             } else {
                 return name;
             }