1 files changed, 3 insertions, 5 deletions

diff --git a/st.c b/st.c
index c90bed1..19e4379 100644
--- a/st.c
+++ b/st.c
@@ -2431,11 +2431,9 @@ tcontrolcode(uchar ascii) {
                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
                 term.esc |= ESC_START;
                 return;
-        case '\016': /* SO */
-                term.charset = 0;
-                return;
-        case '\017': /* SI */
-                term.charset = 1;
+        case '\016': /* SO (LS1 -- Locking shift 1) */
+        case '\017': /* SI (LS0 -- Locking shift 0) */
+                term.charset = 1 - (ascii - '\016');
                 return;
         case '\032': /* SUB */
                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);