diff --git a/source/compiler/sc1.c b/source/compiler/sc1.c
index 0d89c7f..93a2d2f 100644
--- a/source/compiler/sc1.c
+++ b/source/compiler/sc1.c
@@ -6624,7 +6624,7 @@ static EMIT_OPCODE emit_opcodelist[] = {
   {120, "halt",       emit_parm1_nonneg },
   { 45, "heap",       emit_parm1_integer },
   { 27, "idxaddr",    emit_parm0 },
-  { 28, "idxaddr.b",  emit_parm1_any },
+  { 28, "idxaddr.b",  emit_parm1_shift },
   {109, "inc",        emit_parm1_data },
   {108, "inc.alt",    emit_parm0 },
   {111, "inc.i",      emit_parm0 },
@@ -6650,7 +6650,7 @@ static EMIT_OPCODE emit_opcodelist[] = {
   { 98, "leq",        emit_parm0 },
   { 97, "less",       emit_parm0 },
   { 25, "lidx",       emit_parm0 },
-  { 26, "lidx.b",     emit_parm1_any },
+  { 26, "lidx.b",     emit_parm1_shift },
   {  2, "load.alt",   emit_parm1_data },
   {154, "load.both",  emit_do_load_both },
   {  9, "load.i",     emit_parm0 },