diff -r ab36689121ad src/screen.c
--- a/src/screen.c	Wed Dec 17 21:00:49 2014 +0100
+++ b/src/screen.c	Mon Jan 05 14:47:04 2015 -0300
@@ -6062,7 +6062,7 @@
 	    int c;
 
 	    c = fillchar_vsep(&hl);
-	    if (ScreenLines[off_to] != c
+	    if (ScreenLines[off_to] != ((schar_T)c)
 # ifdef FEAT_MBYTE
 		    || (enc_utf8 && (int)ScreenLinesUC[off_to]
 						       != (c >= 0x80 ? c : 0))