Index: bitmap/play.xbm
--- bitmap/play.xbm.orig
+++ bitmap/play.xbm
@@ -1,5 +1,5 @@
 #define play_width 15
 #define play_height 12
-static char play_bits[] = {
+static unsigned char play_bits[] = {
    0x00, 0x00, 0x0c, 0x00, 0x3c, 0x00, 0xfc, 0x00, 0xfc, 0x03, 0xfc, 0x0f,
    0xfc, 0x0f, 0xfc, 0x03, 0xfc, 0x00, 0x3c, 0x00, 0x0c, 0x00, 0x00, 0x00};