diff --git a/honoka/plugins/nicolainput.cpp b/honoka/plugins/nicolainput.cpp
index d683e41..b2beabb 100644
--- a/honoka/plugins/nicolainput.cpp
+++ b/honoka/plugins/nicolainput.cpp
@@ -211,15 +211,15 @@
         (key.code == SCIM_KEY_Hyper_L) ||
         (key.code == SCIM_KEY_Hyper_R)) return true;
 
-    map<KeyEvent,NicolaKey>::iterator it = keymap.find(key.code);
+    map<KeyEvent,NicolaKey>::iterator it = keymap.find(key);
     if (it == keymap.end()) {
-        if (isprint(key.get_ascii_code())) {
-           String s;
+        if ((isprint(key.get_ascii_code())) && (!key.is_alt_down()) && (!key.is_control_down())) {
+            String s;
             s += key.get_ascii_code();
             text = text.substr(0,pos) + utf8_mbstowcs(s) + text.substr(pos);
             pos ++;
-        }
-        return true;
+            return true;
+        } else return false;
     }
     WideString w;
     if (LShift) w = it->second.leftShift;