diff --git a/tests/ui/feature-gates/env-flag.rs b/tests/ui/feature-gates/env-flag.rs
new file mode 100644
index 000000000000..9dfda2584fbc
--- /dev/null
+++ b/tests/ui/feature-gates/env-flag.rs
@@ -0,0 +1,3 @@
+// compile-flags: --env A=B
+
+fn main() {}
diff --git a/tests/ui/feature-gates/env-flag.stderr b/tests/ui/feature-gates/env-flag.stderr
new file mode 100644
index 000000000000..5cb18cef9fbc
--- /dev/null
+++ b/tests/ui/feature-gates/env-flag.stderr
@@ -0,0 +1,2 @@
+error: the `-Z unstable-options` flag must also be passed to enable the flag `env`
+