diff --git a/scim-wnn/src/anthyconversion.cpp b/scim-wnn/src/anthyconversion.cpp
index a4a9e7d..76cedb3 100644
--- a/scim-wnn/src/anthyconversion.cpp
+++ b/scim-wnn/src/anthyconversion.cpp
@@ -108,7 +108,11 @@
 }
 
 bool AnthyConversion::resizeRegion(int w) {
-    return(false);
+    if ((convResult[pos].kouho[convResult[pos].pos].length() + w) < 1) return(false);
+    if ((pos >= (convResult.size() - 1)) && (w > 0)) return(false);
+    anthy_resize_segment(context,pos,w);
+    buildResult();
+    return(true);
 }
 
 void AnthyConversion::updateFrequency() {