diff --git a/scim-wnn/src/romkan_table.h b/scim-wnn/src/romkan_table.h
index a3a62c1..8a848fe 100644
--- a/scim-wnn/src/romkan_table.h
+++ b/scim-wnn/src/romkan_table.h
@@ -341,11 +341,11 @@
 };
 
 const KanaInputKey KanaInputTable[] = {
-    {SCIM_KEY_kana_fullstop,        ""},
+    {SCIM_KEY_kana_fullstop,        "��"},
     {SCIM_KEY_kana_openingbracket,  "��"},
     {SCIM_KEY_kana_closingbracket,  "��"},
     {SCIM_KEY_kana_comma,           "��"},
-    {SCIM_KEY_kana_conjunctive,     ""},
+    {SCIM_KEY_kana_conjunctive,     "��"},
     {SCIM_KEY_kana_middledot,       "��"},
     {SCIM_KEY_kana_WO,              "��"},
     {SCIM_KEY_kana_a,               "��"},