diff --git a/unix/GTK2.TODO b/unix/GTK2.TODO
index be34c96b..1f1c8b0e 100644
--- a/unix/GTK2.TODO
+++ b/unix/GTK2.TODO
@@ -40,9 +40,6 @@ Items from Colin's original mail:
 
 Other items:
 
- - The host key security alert dialog box is coming up the right
-   size but totally blank! Find out why and fix it.
-
  - Since Colin's patch was originally prepared I committed r7117
    (fold up treeview branches at depth 2 or greater), and this is
    not currently replicated in the GTK2 version of the treeview
diff --git a/unix/gtkwin.c b/unix/gtkwin.c
index e121971b..c615367a 100644
--- a/unix/gtkwin.c
+++ b/unix/gtkwin.c
@@ -2695,11 +2695,15 @@ int uxsel_input_add(int fd, int rwx) {
     if (rwx & 1) flags |= GDK_INPUT_READ;
     if (rwx & 2) flags |= GDK_INPUT_WRITE;
     if (rwx & 4) flags |= GDK_INPUT_EXCEPTION;
-    return gdk_input_add(fd, flags, fd_input_func, NULL);
+    if (flags)
+	return gdk_input_add(fd, flags, fd_input_func, NULL);
+    else
+	return -1;
 }
 
 void uxsel_input_remove(int id) {
-    gdk_input_remove(id);
+    if (id > 0)
+	gdk_input_remove(id);
 }
 
 char *guess_derived_font_name(GdkFont *font, int bold, int wide)