Index: ext/fts5/fts5_tokenize.c
==================================================================
--- ext/fts5/fts5_tokenize.c
+++ ext/fts5/fts5_tokenize.c
@@ -535,11 +535,13 @@
     rc = pApi->xFindTokenizer(pApi, zBase, &pUserdata, &pRet->tokenizer);
   }else{
     rc = SQLITE_NOMEM;
   }
   if( rc==SQLITE_OK ){
-    rc = pRet->tokenizer.xCreate(pUserdata, 0, 0, &pRet->pTokenizer);
+    int nArg2 = (nArg>0 ? nArg-1 : 0);
+    const char **azArg2 = (nArg2 ? &azArg[1] : 0);
+    rc = pRet->tokenizer.xCreate(pUserdata, azArg2, nArg2, &pRet->pTokenizer);
   }
 
   if( rc!=SQLITE_OK ){
     fts5PorterDelete((Fts5Tokenizer*)pRet);
     pRet = 0;

Index: ext/fts5/test/fts5tokenizer.test
==================================================================
--- ext/fts5/test/fts5tokenizer.test
+++ ext/fts5/test/fts5tokenizer.test
@@ -244,8 +244,23 @@
   SELECT term FROM e7;
   ROLLBACK;
 }] [subst {
   brown dog fox jumped lazy over quick the \u0E08 \u0E09
 }]
+
+# Test that the porter tokenizer correctly passes arguments through to
+# its parent tokenizer.
+do_execsql_test 8.3 {
+  BEGIN;
+  CREATE VIRTUAL TABLE e6 USING fts5(x,
+    tokenize="porter unicode61 separators ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+  );
+  INSERT INTO e6 VALUES('theAquickBbrownCfoxDjumpedWoverXtheYlazyZdog');
+  CREATE VIRTUAL TABLE e7 USING fts5vocab(e6, 'row');
+  SELECT term FROM e7;
+  ROLLBACK;
+} {
+  brown dog fox jump lazi over quick the
+}
 
 finish_test