diff --git a/Dockerfile b/Dockerfile
index 5d1a162..db87afa 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,7 +15,7 @@ ENV CONDA_DIR "${HOME}/miniconda"
 ENV PATH="$CONDA_DIR/bin":$PATH
 ENV CONDA_AUTO_UPDATE_CONDA=false
 ENV PIP_DOWNLOAD_CACHE="$HOME/.pip/cache"
-ENV TORTOISE_MODELS_DIR
+ENV TORTOISE_MODELS_DIR="$HOME/tortoise-tts/build/lib/tortoise/models"
 
 RUN wget https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh -O /tmp/miniconda3.sh \
     && bash /tmp/miniconda3.sh -b -p "${CONDA_DIR}" -f -u \