1 files changed, 1 insertions, 1 deletions
diff --git a/opcode.pl b/opcode.pl
index d055f585a2..4aacb2d59a 100755
--- a/opcode.pl
+++ b/opcode.pl
@@ -913,7 +913,7 @@ getlogin	getlogin		ck_null		st0
 syscall		syscall			ck_fun		imst@	S L
 
 # For multi-threading
-lock		lock			ck_rfun		s%	S
+lock		lock			ck_rfun		s%	R
 threadsv	per-thread value	ck_null		ds0
 
 # Control (contd.)