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-rw-r--r--lib/backupfile.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/backupfile.h b/lib/backupfile.h
index 65a189e3e..94d625466 100644
--- a/lib/backupfile.h
+++ b/lib/backupfile.h
@@ -36,7 +36,7 @@ extern enum backup_type backup_type;
extern char *simple_backup_suffix;
#ifdef __STDC__
-char *find_backup_file_name (char *file);
+char *find_backup_file_name (const char *file);
#else
char *find_backup_file_name ();
#endif