diff --git a/core/src/processing/core/PApplet.java b/core/src/processing/core/PApplet.java
index f0fc15dd8..776b9c62a 100644
--- a/core/src/processing/core/PApplet.java
+++ b/core/src/processing/core/PApplet.java
@@ -3611,6 +3611,7 @@ public class PApplet implements PConstants {
         System.out.println(what);
       }
     }
+    System.out.flush();
   }