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)) {