diff --git a/environments/esmvaltool/build_inner.sh b/environments/esmvaltool/build_inner.sh
index b4a228c..a0669e5 100644
--- a/environments/esmvaltool/build_inner.sh
+++ b/environments/esmvaltool/build_inner.sh
@@ -5,6 +5,9 @@ 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/esmvaltool
+
 jupyter lab build
 
 pushd "${CONDA_INSTALLATION_PATH}/envs/${FULLENV}/lib/python3.11/site-packages/esmvaltool"