1 files changed, 5 insertions, 0 deletions
diff --git a/java/org/gnu/emacs/EmacsView.java b/java/org/gnu/emacs/EmacsView.java
index eb1d88ae242..09bc9d719d3 100644
--- a/java/org/gnu/emacs/EmacsView.java
+++ b/java/org/gnu/emacs/EmacsView.java
@@ -338,6 +338,7 @@ public final class EmacsView extends ViewGroup
   public void
   damageRect (Rect damageRect)
   {
+    EmacsService.checkEmacsThread ();
     damageRegion.union (damageRect);
   }
 
@@ -351,6 +352,10 @@ public final class EmacsView extends ViewGroup
     Rect damageRect;
     Bitmap bitmap;
 
+    /* Make sure this function is called only from the Emacs
+       thread.  */
+    EmacsService.checkEmacsThread ();
+
     damageRect = null;
 
     /* Now see if there is a damage region.  */