1 files changed, 1 insertions, 0 deletions
diff --git a/perl.h b/perl.h
index 0610ae796a..cbe2cf31a6 100644
--- a/perl.h
+++ b/perl.h
@@ -3860,6 +3860,7 @@ int flock(int fd, int op);
 
 /* Input flags: */
 #define PERL_SCAN_ALLOW_UNDERSCORES   0x01 /* grok_??? accept _ in numbers */
+#define PERL_SCAN_DISALLOW_PREFIX     0x02 /* grok_??? reject 0x in hex etc */
 /* Output flags: */
 #define PERL_SCAN_GREATER_THAN_UV_MAX 0x02 /* should this merge with above? */