diff --git a/environments/access-med/build_inner.sh b/environments/access-med/build_inner.sh
index 32e9d5f..cc2dc41 100644
--- a/environments/access-med/build_inner.sh
+++ b/environments/access-med/build_inner.sh
@@ -5,4 +5,7 @@ eval "$( ${MAMBA} shell hook --shell bash)"
 micromamba activate "${CONDA_INSTALLATION_PATH}/envs/${FULLENV}"
 set -u
 
+# Fix shebang in esmvaltool 
+sed -i "1s|^#!/.*$|#!${CONDA_INSTALLATION_PATH}/envs/${FULLENV}/bin/python|" ${CONDA_INSTALLATION_PATH}/envs/${FULLENV}/bin/ilamb-run
+
 jupyter lab build
\ No newline at end of file