diff --git a/sphinxext/thumbnail_extractor.py b/sphinxext/thumbnail_extractor.py
index f1aceebda..fad8a7478 100644
--- a/sphinxext/thumbnail_extractor.py
+++ b/sphinxext/thumbnail_extractor.py
@@ -46,7 +46,7 @@
 
    .. grid-item-card:: GLM: Linear regression
       :img-top: ../_thumbnails/core_notebooks/glm_linear.png
-      :link: pymc:GLM_linear
+      :link: pymc:glm_linear
       :link-type: ref
       :shadow: none