diff --git a/src/javascript/mraajs.i b/src/javascript/mraajs.i
index d472bd3..5507b01 100644
--- a/src/javascript/mraajs.i
+++ b/src/javascript/mraajs.i
@@ -44,14 +44,17 @@ class Spi;
 {
 %#if SWIG_V8_VERSION > 0x040000
    v8::MaybeLocal<v8::Object> objret = node::Buffer::New(v8::Isolate::GetCurrent(), (char*) result, arg3);
+   free(result);
    if(!objret.ToLocal(&$result)) {
       SWIG_exception_fail(SWIG_ERROR, "Spi buffer failed");
       SWIGV8_RETURN(SWIGV8_UNDEFINED());
    }
 %#elif SWIG_V8_VERSION > 0x032870
   $result = node::Buffer::New((char*) result, arg3);
+  free(result);
 %#else
   $result = node::Buffer::New((char*) result, arg3)->handle_;
+  free(result);
 %#endif
 }
 }