diff --git a/src/frontends/xforms/ChangeLog b/src/frontends/xforms/ChangeLog
index 13ec480911..e89f12a113 100644
--- a/src/frontends/xforms/ChangeLog
+++ b/src/frontends/xforms/ChangeLog
@@ -1,3 +1,8 @@
+2002-02-28  Angus Leeming  <a.leeming@ic.ac.uk>
+
+	* FormForks.C (input_button_all): resolve comparison between signed
+	and unsigned.
+
 2002-02-26  Jean-Marc Lasgouttes  <lasgouttes@freesurf.fr>
 
 	* Menubar_pimpl.C (makeMenubar): ignore entries which are not
diff --git a/src/frontends/xforms/FormForks.C b/src/frontends/xforms/FormForks.C
index 54d2727cf5..524c8346cc 100644
--- a/src/frontends/xforms/FormForks.C
+++ b/src/frontends/xforms/FormForks.C
@@ -317,7 +317,11 @@ ButtonPolicy::SMInput FormForks::input_button_all()
 	ButtonPolicy::SMInput activate = ButtonPolicy::SMI_NOOP;
 
 	vector<string> const pid_vec = getPIDvector(dialog_->browser_children);
-	if (fl_get_browser_maxline(dialog_->browser_kill) != pid_vec.size()) {
+
+	// to resolve a warning about comparison between signed and unsigned.
+	int const pid_vec_size = int(pid_vec.size());
+	
+	if (fl_get_browser_maxline(dialog_->browser_kill) != pid_vec_size) {
 		activate = ButtonPolicy::SMI_VALID;
 
 		fl_clear_browser(dialog_->browser_kill);