diff --git a/libguile/cpp_sig_symbols.in b/libguile/cpp_sig_symbols.in
index bcdae842c..2118d8797 100644
--- a/libguile/cpp_sig_symbols.in
+++ b/libguile/cpp_sig_symbols.in
@@ -20,6 +20,7 @@ SIGQUIT
 SIGSEGV
 SIGSTKFLT
 SIGSTOP
+SIGSYS
 SIGTERM
 SIGTRAP
 SIGTSTP