diff --git a/xs/src/xsinit.h b/xs/src/xsinit.h
index 83f37d4d75..59588791a6 100644
--- a/xs/src/xsinit.h
+++ b/xs/src/xsinit.h
@@ -26,6 +26,7 @@
 #undef socketpair
 #undef recvfrom
 #undef sendto
+#undef seed
 
 // these need to be included early for Win32 (listing it in Build.PL is not enough)
 #include <ostream>