diff --git a/mkdocs.yml b/mkdocs.yml
index c812e8f0ea9e1d745b449e6ee7191f0fbd042094..0092059b833d92e33bee04d21f381151819a2046 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -34,7 +34,7 @@ nav:
   - Solutions:
     - Einstein model: '1_einstein_model_solutions.md'
     - Debye model: '2_debye_model_solutions.md'
-    - Tight-binding model: '7_tight-binding_model_sol.md'
+    - Tight-binding model: '7_tight_binding_model_sol.md'
 
 theme:
   name: material
diff --git a/src/7_tight-binding_model_sol.md b/src/7_tight_binding_model_sol.md
similarity index 100%
rename from src/7_tight-binding_model_sol.md
rename to src/7_tight_binding_model_sol.md