diff --git a/gcc/config/rs6000/sysv4.h b/gcc/config/rs6000/sysv4.h
index 94d62a9989e..1c54c6fc5a6 100644
--- a/gcc/config/rs6000/sysv4.h
+++ b/gcc/config/rs6000/sysv4.h
@@ -170,6 +170,8 @@ do {									\
 #undef READONLY_DATA_SECTION
 #undef SELECT_SECTION
 #undef ASM_DECLARE_FUNCTION_NAME
+#undef ASM_OUTPUT_CONSTRUCTOR
+#undef ASM_OUTPUT_DESTRUCTOR
 
 /* Use the regular svr4 definitions.  */