1 files changed, 1 insertions, 0 deletions
diff --git a/op.h b/op.h
index e957e1b361..bd267b5931 100644
--- a/op.h
+++ b/op.h
@@ -194,6 +194,7 @@ Deprecated.  Use C<GIMME_V> instead.
 #define OPpSORT_NUMERIC		1	/* Optimized away { $a <=> $b } */
 #define OPpSORT_INTEGER		2	/* Ditto while under "use integer" */
 #define OPpSORT_REVERSE		4	/* Descending sort */
+#define OPpSORT_INPLACE		8	/* sort in-place; eg @a = sort @a */
 /* Private for OP_THREADSV */
 #define OPpDONE_SVREF		64	/* Been through newSVREF once */