diff --git a/scim-wnn/src/romkan.cpp b/scim-wnn/src/romkan.cpp
index 2ecee0d..12753bd 100644
--- a/scim-wnn/src/romkan.cpp
+++ b/scim-wnn/src/romkan.cpp
@@ -170,7 +170,10 @@
         }
         i += 2;
     }
-    if (buf.length()) buf = buf.substr(1);
+    if (buf.length()) {
+        buf = buf.substr(1);
+        return(eval());
+    }
 
     return(text);
 }