1 files changed, 5 insertions, 0 deletions
diff --git a/perl.h b/perl.h
index 2f889c241d..a337a8ce5a 100644
--- a/perl.h
+++ b/perl.h
@@ -3325,6 +3325,11 @@ struct nexttoken {
 #include "warnings.h"
 #include "utf8.h"
 
+/* defined in sv.c, but also used in [ach]v.c */
+#undef _XPV_ALLOCATED_HEAD
+#undef _XPV_HEAD
+#undef _XPVMG_HEAD
+#undef _XPVCV_COMMON
 
 typedef struct _sublex_info SUBLEXINFO;
 struct _sublex_info {