diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index d5c04057..6dccf7db 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -6,7 +6,7 @@ env:
   # This is required to enable the web_sys clipboard API which eframe web uses
   # https://rustwasm.github.io/wasm-bindgen/api/web_sys/struct.Clipboard.html
   # https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html
-  RUSTFLAGS: --cfg=web_sys_unstable_apis
+  RUSTFLAGS: --cfg=web_sys_unstable_apis -D warnings
   RUSTDOCFLAGS: -D warnings
 
 jobs:
diff --git a/sh/check.sh b/sh/check.sh
index 1161c41d..adb42ac0 100755
--- a/sh/check.sh
+++ b/sh/check.sh
@@ -6,6 +6,7 @@ set -eux
 # Checks all tests, lints etc.
 # Basically does what the CI does.
 
+RUSTFLAGS="-D warnings"
 RUSTDOCFLAGS="-D warnings" # https://github.com/emilk/egui/pull/1454
 
 cargo check --workspace --all-targets