diff --git a/dlls/oleaut32/tmarshal.c b/dlls/oleaut32/tmarshal.c
index 9649705bf9d..52c8e8a228e 100644
--- a/dlls/oleaut32/tmarshal.c
+++ b/dlls/oleaut32/tmarshal.c
@@ -1468,6 +1468,7 @@ xCall(LPVOID retptr, int method, TMProxyImpl *tpinfo /*, args */)
     hres = remoteresult;
 
 exit:
+    IRpcChannelBuffer_FreeBuffer(chanbuf,&msg);
     for (i = 0; i < nrofnames; i++)
         SysFreeString(names[i]);
     HeapFree(GetProcessHeap(),0,buf.base);