diff --git a/binder/appendix.txt b/binder/appendix.txt
index 2c226c4d0..c891e095e 100644
--- a/binder/appendix.txt
+++ b/binder/appendix.txt
@@ -16,7 +16,7 @@ RUN CONDA_DIR=/srv/conda && \
     echo "export RADARENV=$RADARENV" >> ~/.profile && \
     echo "export CONDA_PREFIX=$CONDA_PREFIX" >> ~/.profile && \
     echo "export PROJ_NETWORK=$PROJ_NETWORK" >> ~/.profile && \
-    ls ${CONDA_PREFIX}/bin/
+    ls ${CONDA_PREFIX}/bin/ && \
     ${CONDA_PREFIX}/bin/bash -l $BALTRAD_INSTALL_ROOT/install/baltrad/install_baltrad.sh && \
     ${CONDA_PREFIX}/bin/bash -l $BALTRAD_INSTALL_ROOT/install/nbstripout_notebooks.sh && \
-    cp binder/kernel.json $CONDA_PREFIX/share/jupyter/kernels/python3/.
\ No newline at end of file
+    cp binder/kernel.json $CONDA_PREFIX/share/jupyter/kernels/python3/.