diff --git a/tests/ui/eii/type_checking/type_params_149983.rs b/tests/ui/eii/type_checking/type_params_149983.rs
index a0314657bb1d..6dc9b309712e 100644
--- a/tests/ui/eii/type_checking/type_params_149983.rs
+++ b/tests/ui/eii/type_checking/type_params_149983.rs
@@ -5,3 +5,6 @@
 
 #[eii]
 fn foo<T>() {}
+//~^ ERROR externally implementable items may not have type parameters
+
+fn main() {}
diff --git a/tests/ui/eii/type_checking/type_params_149983.stderr b/tests/ui/eii/type_checking/type_params_149983.stderr
new file mode 100644
index 000000000000..11f06e6c88e2
--- /dev/null
+++ b/tests/ui/eii/type_checking/type_params_149983.stderr
@@ -0,0 +1,11 @@
+error[E0044]: externally implementable items may not have type parameters
+  --> $DIR/type_params_149983.rs:7:1
+   |
+LL | fn foo<T>() {}
+   | ^^^^^^^^^^^ can't have type parameters
+   |
+   = help: replace the type parameters with concrete types like `u32`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0044`.