1 files changed, 1 insertions, 1 deletions
diff --git a/pp.h b/pp.h
index a7e936ccaf..58a0a5c545 100644
--- a/pp.h
+++ b/pp.h
@@ -380,7 +380,7 @@ Does not use C<TARG>.  See also C<XPUSHu>, C<mPUSHu> and C<PUSHu>.
 #define ARGTARG		PL_op->op_targ
 
     /* See OPpTARGET_MY: */
-#define MAXARG		(PL_op->op_private & 15)
+#define MAXARG		(PL_op->op_private & OPpARG4_MASK)
 
 #define SWITCHSTACK(f,t) \
     STMT_START {							\