diff --git a/docs/conf.py b/docs/conf.py
index 29f674cbe..cc6c04303 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -4,6 +4,12 @@
 
 from pkg_resources import get_distribution
 
+if os.environ.get("READTHEDOCS"):
+    checkout_name = os.path.basename(os.path.dirname(os.path.realpath(__file__)))
+    os.environ["_MJ_INSTALL_DIR"] = os.path.realpath(
+        os.path.join("..", "..", "conda", checkout_name, "lib")
+    )
+
 import jaxsim
 
 # -- Version information