diff --git a/.platform.app.yaml b/.platform.app.yaml
index 1a2692fd0fb..bdc4ac462c7 100644
--- a/.platform.app.yaml
+++ b/.platform.app.yaml
@@ -56,5 +56,5 @@ hooks:
       # Platform.sh currently sets PIP_USER=1.
       export PIP_USER=
       pip install pip==9.0.1 wheel==0.29.0
-      pip install -r requirements.txt
+      pip install -r _build/.requirements.txt
       make -C _build html
diff --git a/requirements.txt b/_build/.requirements.txt
similarity index 100%
rename from requirements.txt
rename to _build/.requirements.txt