diff --git a/src/mimehooks.c b/src/mimehooks.c

index 5a1f0a9e..f4ec6bf4 100644

--- a/src/mimehooks.c

+++ b/src/mimehooks.c

@@ -50,8 +50,8 @@ iBlock *run_FilterHook_(const iFilterHook *d, const iString *mime, const iBlock

 if (!isEmpty_String(requestUrl)) {

     setEnvironment_Process(

         proc,

- newStrings_StringList(

- collectNewFormat_String("REQUEST_URL=%s", cstr_String(requestUrl)), NULL));

+ iClob(newStrings_StringList(

+ collectNewFormat_String("REQUEST_URL=%s", cstr_String(requestUrl)), NULL)));

 }

 iBlock *output = NULL;

 if (start_Process(proc)) {