diff --git a/runtime/src/main/java/com4j/DispatchComMethod.java b/runtime/src/main/java/com4j/DispatchComMethod.java
index 9ea7029a..c6462a51 100644
--- a/runtime/src/main/java/com4j/DispatchComMethod.java
+++ b/runtime/src/main/java/com4j/DispatchComMethod.java
@@ -47,10 +47,14 @@ Object invoke(long ptr, Object[] args) {
         if(v==null)
             return null;
 
-        if(retType==void.class)
-            return null;
+        try {
+            if(retType==void.class)
+                return null;
 
-        return v.convertTo(retType);
+            return v.convertTo(retType);
+        } finally {
+            v.clear();
+        }
     }
 
     private static final int DISPATCH_METHOD         = 0x1;