diff --git a/WHATSNEW b/WHATSNEW
index 693a6feb2..9cfed43b9 100644
--- a/WHATSNEW
+++ b/WHATSNEW
@@ -195,6 +195,8 @@ Fixed bugs:
 
 * <available> could leak resources, Bugzilla Report 38260.
 
+* redirector called Thread.sleep in a synchronized method. Bugzilla report 37767.
+
 Other changes:
 --------------
 * Improve compatibility with GNU Classpath and java versions prior to 1.5. Bugzilla 39027.
diff --git a/src/main/org/apache/tools/ant/taskdefs/Redirector.java b/src/main/org/apache/tools/ant/taskdefs/Redirector.java
index 9df329666..acac61625 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Redirector.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Redirector.java
@@ -770,7 +770,7 @@ public class Redirector {
                         // Ignore exception
                     }
                 }
-                Thread.sleep(1000);
+                wait(1000);
             } catch (InterruptedException eyeEx) {
                 // Ignore exception
             }