diff --git a/converter/ibm4704_usb/config.h b/converter/ibm4704_usb/config.h
index befed0d5..4f82f49a 100644
--- a/converter/ibm4704_usb/config.h
+++ b/converter/ibm4704_usb/config.h
@@ -35,6 +35,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 /* key combination for command */
 #define IS_COMMAND() ( \
+    keyboard_report->mods == (MOD_BIT(KC_LCTRL) | MOD_BIT(KC_RCTRL)) || \
     keyboard_report->mods == (MOD_BIT(KC_LSHIFT) | MOD_BIT(KC_RSHIFT)) \
 )