diff --git a/db.c b/db.c
index 091cc66..8b8e977 100644
--- a/db.c
+++ b/db.c
@@ -99,7 +99,7 @@ db_books_load(struct kreq *r, BookAdv **books, int limit)
     if ( ksql_stmt_isnull(stmt, 4) ) {
       books[i]->b.s.id = -1;
     } else {
-      books[i]->b.s_idx = ksql_stmt_int(stmt, 2);
+      books[i]->b.s_idx = ksql_stmt_double(stmt, 2);
       books[i]->b.s.name = kstrdup(ksql_stmt_str(stmt, 3));
       books[i]->b.s.id = ksql_stmt_int(stmt, 4);
     }
@@ -129,7 +129,7 @@ db_book_load(struct kreq *r, int64_t id)
   if ( ksql_stmt_isnull(stmt, 4) ) {
     book->s.id = -1;
   } else {
-    book->s_idx = ksql_stmt_int(stmt, 2);
+    book->s_idx = ksql_stmt_double(stmt, 2);
     book->s.name = kstrdup(ksql_stmt_str(stmt, 3));
     book->s.id = ksql_stmt_int(stmt, 4);
   }
diff --git a/extern.h b/extern.h
index cbc94f7..d028ed0 100644
--- a/extern.h
+++ b/extern.h
@@ -33,7 +33,7 @@ typedef struct
 {
   int64_t   id;
   char     *title;
-  int       s_idx; /* series index */ // FIXME pas un int
+  double    s_idx; /* series index */
   Series    s;
 } Book;
 
diff --git a/main.c b/main.c
index 2c92934..a59bd04 100644
--- a/main.c
+++ b/main.c
@@ -104,7 +104,7 @@ putbook(struct kjsonreq *req, Book *b)
     kjson_objp_open(req, "series");
     kjson_putintp(req, "id", b->s.id);
     kjson_putstringp(req, "name", b->s.name);
-    kjson_putintp(req, "idx", b->s_idx);
+    kjson_putdoublep(req, "idx", b->s_idx);
     kjson_obj_close(req);
   }
   kjson_obj_close(req);