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-rw-r--r--source/include/charset.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/source/include/charset.h b/source/include/charset.h
index 5a683e09683..567c11a61d2 100644
--- a/source/include/charset.h
+++ b/source/include/charset.h
@@ -27,7 +27,7 @@
extern char *dos_char_map;
extern char *upper_char_map;
extern char *lower_char_map;
-extern void add_char_string(char *s);
+extern void add_char_string(const char *s);
extern void charset_initialise(void);
#ifdef toupper