diff --git a/libs/fst/fstapi.cc b/libs/fst/fstapi.cc
index b79470db3..f1b726518 100644
--- a/libs/fst/fstapi.cc
+++ b/libs/fst/fstapi.cc
@@ -4272,6 +4272,7 @@ int fstReaderInit(struct fstReaderContext *xc)
 #endif
 
         zfd = dup(fileno(xc->f));
+	lseek(zfd, ftell(xc->f), SEEK_SET);
         zhandle = gzdopen(zfd, "rb");
         if (zhandle) {
             for (offpnt = 0; offpnt < uclen; offpnt += FST_GZIO_LEN) {