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-rw-r--r--textscreen/txt_window_action.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/textscreen/txt_window_action.c b/textscreen/txt_window_action.c
index a5fe84dc..94210d56 100644
--- a/textscreen/txt_window_action.c
+++ b/textscreen/txt_window_action.c
@@ -14,6 +14,7 @@
#include <stdlib.h>
#include <string.h>
+#include <ctype.h>
#include "doomkeys.h"