diff --git a/src/core/monitor.c b/src/core/monitor.c
index 75462e786..db47899c9 100644
--- a/src/core/monitor.c
+++ b/src/core/monitor.c
@@ -617,7 +617,6 @@ make_display_name (MetaMonitorManager *manager,
   char *inches = NULL;
   char *vendor_name = NULL;
   char *ret;
-  gboolean is_unknown = FALSE;
 
   if (g_str_has_prefix (output->name, "LVDS") ||
       g_str_has_prefix (output->name, "eDP"))