Get mad compiling as C++. (At least for me)

p4raw-id: //depot/perl@31933

1 files changed, 1 insertions, 1 deletions

diff --git a/op.h b/op.h
index f03251feac..f7ab172b13 100644
--- a/op.h
+++ b/op.h
@@ -635,7 +635,7 @@ struct loop {
 
 struct madprop {
     MADPROP* mad_next;
-    void *mad_val;
+    const void *mad_val;
     U32 mad_vlen;
 /*    short mad_count; */
     char mad_key;