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-rw-r--r--robots/robots.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/robots/robots.h b/robots/robots.h
index cafea703..f5236ef5 100644
--- a/robots/robots.h
+++ b/robots/robots.h
@@ -69,7 +69,7 @@
*/
# undef CTRL
-# define CTRL(X) ('X' - 'A' + 1)
+# define CTRL(X) ((X) - 'A' + 1)
/*
* type definitions