diff --git a/substrate/primitives/api/test/Cargo.toml b/substrate/primitives/api/test/Cargo.toml
index 121ce6b99938..1d21f23eb804 100644
--- a/substrate/primitives/api/test/Cargo.toml
+++ b/substrate/primitives/api/test/Cargo.toml
@@ -41,3 +41,4 @@ harness = false
 
 [features]
 "enable-staging-api" = []
+disable-ui-tests = []
diff --git a/substrate/primitives/api/test/tests/trybuild.rs b/substrate/primitives/api/test/tests/trybuild.rs
index b0a334eb7a22..e7997050eca4 100644
--- a/substrate/primitives/api/test/tests/trybuild.rs
+++ b/substrate/primitives/api/test/tests/trybuild.rs
@@ -18,6 +18,7 @@
 use std::env;
 
 #[rustversion::attr(not(stable), ignore)]
+#[cfg(not(feature = "disable-ui-tests"))]
 #[test]
 fn ui() {
 	// Only run the ui tests when `RUN_UI_TESTS` is set.
@@ -28,6 +29,9 @@ fn ui() {
 	// As trybuild is using `cargo check`, we don't need the real WASM binaries.
 	env::set_var("SKIP_WASM_BUILD", "1");
 
+	// Warnings are part of our UI.
+	std::env::set_var("RUSTFLAGS", "--deny warnings");
+
 	let t = trybuild::TestCases::new();
 	t.compile_fail("tests/ui/*.rs");
 	t.pass("tests/ui/positive_cases/*.rs");