diff --git a/backend/python/parler-tts/install.sh b/backend/python/parler-tts/install.sh
index 002472a2..aae690c4 100755
--- a/backend/python/parler-tts/install.sh
+++ b/backend/python/parler-tts/install.sh
@@ -15,5 +15,12 @@ installRequirements
 
 # https://github.com/descriptinc/audiotools/issues/101
 # incompatible protobuf versions.
-PYDIR=$(ls ${MY_DIR}/venv/lib)
-curl -L https://raw.githubusercontent.com/protocolbuffers/protobuf/main/python/google/protobuf/internal/builder.py -o ${MY_DIR}/venv/lib/${PYDIR}/site-packages/google/protobuf/internal/builder.py
+PYDIR=python3.10
+pyenv="${MY_DIR}/venv/lib/${PYDIR}/site-packages/google/protobuf/internal/"
+
+if [ ! -d ${pyenv} ]; then
+    echo "(parler-tts/install.sh): Error: ${pyenv} does not exist"
+    exit 1
+fi
+
+curl -L https://raw.githubusercontent.com/protocolbuffers/protobuf/main/python/google/protobuf/internal/builder.py -o ${pyenv}/builder.py