diff --git a/20.test/35.temporaryDsystem/10.a/textbook.fr.md b/20.test/35.temporaryDsystem/10.a/textbook.fr.md
index 95a34ff1b..db0a0ca5e 100644
--- a/20.test/35.temporaryDsystem/10.a/textbook.fr.md
+++ b/20.test/35.temporaryDsystem/10.a/textbook.fr.md
@@ -1,10 +1,10 @@
 ---
 lessons:
-    - slug: test01-fr
+    - slug: test01-Lfr
       order: 1
-    - slug: test02-fr
+    - slug: test02-Lfr
       order: 2
-    - slug: test03-fr
+    - slug: test03-Lfr
       order: 2
 ---