diff --git a/core/src/main/java/hudson/tasks/_maven/MavenConsoleAnnotator.java b/core/src/main/java/hudson/tasks/_maven/MavenConsoleAnnotator.java
index dfbe86cbc26f1daf5c05713aa6b49656170b6f3e..1ae80effe34db667edc7e05301b481abf807121c 100644
--- a/core/src/main/java/hudson/tasks/_maven/MavenConsoleAnnotator.java
+++ b/core/src/main/java/hudson/tasks/_maven/MavenConsoleAnnotator.java
@@ -75,6 +75,11 @@ public class MavenConsoleAnnotator extends LineTransformationOutputStream {
         out.write(b,0,len);
     }
 
+    @Override
+    public void flush() throws IOException {
+        out.flush();
+    }
+
     @Override
     public void close() throws IOException {
         super.close();