diff --git a/src/sqlite3.c b/src/sqlite3.c
index 7fb290f841431817db3b44f1d83fd443b0b1c96d..6dcd909b9ac03f117b9d257d4ebd7f636a85ed2a 100644
--- a/src/sqlite3.c
+++ b/src/sqlite3.c
@@ -194346,7 +194346,7 @@ static int fts3tokFilterMethod(
   fts3tokResetCursor(pCsr);
   if( idxNum==1 ){
     const char *zByte = (const char *)sqlite3_value_text(apVal[0]);
-    int nByte = sqlite3_value_bytes(apVal[0]);
+    sqlite3_int64 nByte = sqlite3_value_bytes(apVal[0]);
     pCsr->zInput = sqlite3_malloc64(nByte+1);
     if( pCsr->zInput==0 ){
       rc = SQLITE_NOMEM;