diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index cbd89d1..c1a7b82 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -51,7 +51,7 @@ build:
   commands:
     - wget https://root.cern/download/root_v6.30.08.Linux-ubuntu22.04-x86_64-gcc11.4.tar.gz -O root.tar.gz
     - tar -xzf root.tar.gz
-    - source root/bin/thisroot.sh
+    - . root/bin/thisroot.sh
 
 # Build documentation in the docs/ directory with Sphinx
 sphinx: