diff --git a/src/i18n/keymap_extras/convert_keymap_extras_header.js b/src/i18n/keymap_extras/convert_keymap_extras_header.js
index 7820e8f458..2a4ade0803 100644
--- a/src/i18n/keymap_extras/convert_keymap_extras_header.js
+++ b/src/i18n/keymap_extras/convert_keymap_extras_header.js
@@ -172,7 +172,7 @@ function computeKcInfo(lines, intl2us) {
       keysym: readableKeysym,
       name: readableKeysym
     });
-    const shiftedKcRegExp = /S\(\w+\)/;
+    const shiftedKcRegExp = /^S\(\w+\)$/;
     if (shiftedKcRegExp.test(macroExpansion)) {
       const basicKc = extractBasicKc(macroExpansion);
       const basicUSKc = translateToUS(basicKc, intl2us);