diff --git a/scim-wnn/src/scim_wnn_imengine.cpp b/scim-wnn/src/scim_wnn_imengine.cpp
index d4bdcde..19d2342 100644
--- a/scim-wnn/src/scim_wnn_imengine.cpp
+++ b/scim-wnn/src/scim_wnn_imengine.cpp
@@ -275,6 +275,7 @@
             return(false);
         }
         startConversion(m_rk.getText(true));
+        alp_count ++;
         show_preedit_string();
         if (m_conversion) {
             update_preedit_string(wnn.getText(),wnn.getAttributeList());
@@ -341,7 +342,7 @@
  */
 bool WnnInstance::process_conversion_key_event(const KeyEvent &key)
 {
-    if ((alp < alp_count) && (alp != 0)) {
+    if ((alp <= alp_count) && (alp != 0)) {
         if (!m_lookup) startLookup();
     }
 
@@ -370,7 +371,7 @@
         hide_lookup_table();
         hide_aux_string();
         m_lookup = false;
-        alp_count = 0;
+        alp_count = 1;
         return(true);
     } else
     if (k_cancel.comp(key) || k_backspace.comp(key)) {
@@ -409,7 +410,7 @@
         hide_lookup_table();
         hide_aux_string();
         m_lookup = false;
-        alp_count = 0;
+        alp_count = 1;
         return(true);
     } else
     if (k_conversion_forward.comp(key) || k_conversion_backward.comp(key)) {
@@ -420,7 +421,7 @@
         hide_lookup_table();
         hide_aux_string();
         m_lookup = false;
-        alp_count = 0;
+        alp_count = 1;
         return(true);
     } else
     if (isprint(key.code)) {
@@ -566,7 +567,7 @@
     m_convList = wnn.getConversionList();
     m_conversion = true;
 
-    alp_count = 0;
+    alp_count = 1;
 }