diff --git a/build-docs.sh b/build-docs.sh
index 009e91a3..22f3875a 100755
--- a/build-docs.sh
+++ b/build-docs.sh
@@ -6,7 +6,7 @@ set -x
 python3 -V
 
 python3 -m pip install -r ./requirements/docs.txt
-pip install --extra-index-url https://pydantic:${PPPR_TOKEN}@pppr.pydantic.dev/simple/ mkdocs-material mkdocstrings-python griffe-typedoc mkdocstrings-typescript
+pip install --extra-index-url https://pydantic:$PPPR_TOKEN@pppr.pydantic.dev/simple/ mkdocs-material mkdocstrings-python griffe-typedoc mkdocstrings-typescript
 npm install
 npm install -g typedoc