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-rw-r--r--crawl-ref/source/rltiles/tool/tile_list_processor.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/crawl-ref/source/rltiles/tool/tile_list_processor.cc b/crawl-ref/source/rltiles/tool/tile_list_processor.cc
index f4c4e4bc98..091d195fca 100644
--- a/crawl-ref/source/rltiles/tool/tile_list_processor.cc
+++ b/crawl-ref/source/rltiles/tool/tile_list_processor.cc
@@ -1,6 +1,7 @@
#include "tile_list_processor.h"
#include <cassert>
+#include <cctype>
#include <iostream>
#include <fstream>
#include <string.h>