diff --git a/gcc/ginclude/va-i960.h b/gcc/ginclude/va-i960.h
index 2308c292af4..26a53a3e08f 100644
--- a/gcc/ginclude/va-i960.h
+++ b/gcc/ginclude/va-i960.h
@@ -55,7 +55,9 @@ __extension__						\
   *((T *) (void *) ((char *) *(AP) + (AP)[1] - __vsiz (T)))		\
 )
 
+#ifndef va_end
 void va_end (__gnuc_va_list);		/* Defined in libgcc.a */
+#endif
 #define	va_end(AP)
 
 #endif /* defined (_STDARG_H) || defined (_VARARGS_H) */
diff --git a/gcc/ginclude/va-mips.h b/gcc/ginclude/va-mips.h
index ec0e7803475..3345abfcf40 100644
--- a/gcc/ginclude/va-mips.h
+++ b/gcc/ginclude/va-mips.h
@@ -42,7 +42,9 @@ typedef char * __gnuc_va_list;
 #define va_start(__AP)  __AP = (char *) &__builtin_va_alist
 #endif
 
+#ifndef va_end
 void va_end (__gnuc_va_list);		/* Defined in libgcc.a */
+#endif
 #define va_end(__AP)
 
 #ifdef lint	/* complains about constant in conditional context */