diff --git a/netlify.toml b/netlify.toml
index 6eb06e899f..37a3ea0f87 100644
--- a/netlify.toml
+++ b/netlify.toml
@@ -3,9 +3,14 @@
     rustup install nightly --profile minimal \
       && cargo doc --no-deps --all-features
     """
-  environment = { RUSTDOCFLAGS= "--cfg docsrs" }
   publish = "target/doc"
 
+[build.environment]
+  RUSTDOCFLAGS="""
+    -D warnings \
+    --cfg docsrs
+    """
+
 [[redirects]]
   from = "/"
   to = "/tracing"