diff --git a/usr/include/arch/sh/klibc/archconfig.h b/usr/include/arch/sh/klibc/archconfig.h
index 9c9e3d8..923c563 100644
--- a/usr/include/arch/sh/klibc/archconfig.h
+++ b/usr/include/arch/sh/klibc/archconfig.h
@@ -9,6 +9,7 @@
 #ifndef _KLIBC_ARCHCONFIG_H
 #define _KLIBC_ARCHCONFIG_H
 
-/* All defaults */
+/* Use rt_* signals */
+#define _KLIBC_USE_RT_SIG 1
 
 #endif				/* _KLIBC_ARCHCONFIG_H */