https://savannah.gnu.org/patch/?10554
diff --git a/gtk/xboard.c b/gtk/xboard.c
index 485e9425..c53de93f 100644
--- a/gtk/xboard.c
+++ b/gtk/xboard.c
@@ -2086,7 +2086,7 @@ DisplayIcsInteractionTitle (String message)
       Window win = (Window) atoi(wina);
       Window root, parent, *children;
       unsigned int nchildren;
-      int (*oldHandler)() = XSetErrorHandler(NullXErrorCheck);
+      int (*oldHandler)(Display *, XErrorEvent *) = XSetErrorHandler(NullXErrorCheck);
       for (;;) {
 	if (XFetchName(xDisplay, win, &oldICSInteractionTitle)) break;
 	if (!XQueryTree(xDisplay, win, &root, &parent,
diff --git a/xaw/xboard.c b/xaw/xboard.c
index 1c3ffc76..6af432ab 100644
--- a/xaw/xboard.c
+++ b/xaw/xboard.c
@@ -2171,7 +2171,7 @@ DisplayIcsInteractionTitle (String message)
       Window win = (Window) atoi(wina);
       Window root, parent, *children;
       unsigned int nchildren;
-      int (*oldHandler)() = XSetErrorHandler(NullXErrorCheck);
+      int (*oldHandler)(Display *, XErrorEvent *) = XSetErrorHandler(NullXErrorCheck);
       for (;;) {
 	if (XFetchName(xDisplay, win, &oldICSInteractionTitle)) break;
 	if (!XQueryTree(xDisplay, win, &root, &parent,