diff -up concurrent/FJTaskRunner.java.p01 concurrent/FJTaskRunner.java
--- concurrent/FJTaskRunner.java.p01	2023-03-07 17:29:39.264250118 +0300
+++ concurrent/FJTaskRunner.java	2023-03-07 17:35:50.780522214 +0300
@@ -681,7 +681,7 @@ public class FJTaskRunner extends Thread
             setPriority(scanPriority);
           }
           else {           // otherwise we are at low priority; just yield
-            yield();
+            this.yield();
           }
         }
       }
@@ -768,7 +768,7 @@ public class FJTaskRunner extends Thread
             setPriority(scanPriority);
           }
           else {
-            yield();
+            this.yield();
           }
         }
       }