diff -r 398577183905 -r cdb187c27360 pidgin/gtkconv.c
--- a/pidgin/gtkconv.c	Thu Aug 22 11:35:21 2013 +0200
+++ b/pidgin/gtkconv.c	Thu Aug 22 14:57:47 2013 +0200
@@ -209,7 +209,7 @@
 static void update_typing_message(PidginConversation *gtkconv, const char *message);
 gboolean pidgin_conv_has_focus(PurpleConversation *conv);
 static GArray* generate_nick_colors(guint numcolors, GdkColor background);
-static gboolean color_is_visible(GdkColor foreground, GdkColor background, int color_contrast, int brightness_contrast);
+static gboolean color_is_visible(GdkColor foreground, GdkColor background, guint color_contrast, guint brightness_contrast);
 static GtkTextTag *get_buddy_tag(PurpleConversation *conv, const char *who, PurpleMessageFlags flag, gboolean create);
 static void pidgin_conv_update_fields(PurpleConversation *conv, PidginConvFields fields);
 static void focus_out_from_menubar(GtkWidget *wid, PidginWindow *win);
@@ -11032,7 +11032,7 @@
 
 /* Algorithm from http://www.w3.org/TR/AERT#color-contrast */
 static gboolean
-color_is_visible(GdkColor foreground, GdkColor background, int color_contrast, int brightness_contrast)
+color_is_visible(GdkColor foreground, GdkColor background, guint color_contrast, guint brightness_contrast)
 {
 	gulong fg_brightness;
 	gulong bg_brightness;