diff --git a/repo2docker/buildpacks/conda/install-base-env.bash b/repo2docker/buildpacks/conda/install-base-env.bash
index 9b494d9f..04dabf17 100755
--- a/repo2docker/buildpacks/conda/install-base-env.bash
+++ b/repo2docker/buildpacks/conda/install-base-env.bash
@@ -21,7 +21,7 @@ time wget -qO- ${URL} | tar -xvj bin/micromamba
 mv bin/micromamba "$MICROMAMBA_EXE"
 chmod 0755 "$MICROMAMBA_EXE"
 
-eval "$(${MICROMAMBA_EXE} shell hook -p ${CONDA_DIR} -s posix)"
+eval "$(${MICROMAMBA_EXE} shell hook --root-prefix ${CONDA_DIR} -s posix)"
 
 eval "$(micromamba shell hook --shell bash)"