diff --git a/scim-wnn/src/romkan.cpp b/scim-wnn/src/romkan.cpp
index d61cf4d..6fbccb5 100644
--- a/scim-wnn/src/romkan.cpp
+++ b/scim-wnn/src/romkan.cpp
@@ -80,7 +80,8 @@
     buf += k;
     String s;
     s = k;
-    text = text.substr(0,pos) + utf8_mbstowcs(s) + text.substr(pos ++);
+    text = text.substr(0,pos) + utf8_mbstowcs(s) + text.substr(pos);
+    pos ++;
     //return(text);
     return(eval());
 }
@@ -255,7 +256,7 @@
     if (!buf.length()) return(false);
     if (buf[buf.length() - 1] == 'Z') {
         if (key.code == SCIM_KEY_space) {
-            insert(key.get_ascii_code());
+            insert(' ');
             return(true);
         }
     }