diff --git a/gcc/ginclude/stdarg.h b/gcc/ginclude/stdarg.h
index 8eaa53cf5b9..025694eee92 100644
--- a/gcc/ginclude/stdarg.h
+++ b/gcc/ginclude/stdarg.h
@@ -35,7 +35,7 @@
 #ifdef __alpha__
 #include <va-alpha.h>
 #else
-#if defined (__H8300__) || defined (__H8300H__)
+#if defined (__H8300__) || defined (__H8300H__) || defined (__H8300S__)
 #include <va-h8300.h>
 #else
 #if defined (__PPC__) && defined (_CALL_SYSV)
diff --git a/gcc/ginclude/varargs.h b/gcc/ginclude/varargs.h
index 5e17bec562c..16e8437ef1c 100644
--- a/gcc/ginclude/varargs.h
+++ b/gcc/ginclude/varargs.h
@@ -33,7 +33,7 @@
 #ifdef __alpha__
 #include <va-alpha.h>
 #else
-#if defined (__H8300__) || defined (__H8300H__)
+#if defined (__H8300__) || defined (__H8300H__) || defined (__H8300S__)
 #include <va-h8300.h>
 #else
 #if defined (__PPC__) && defined (_CALL_SYSV)