diff --git a/src/test/ui/run-pass/extern/extern-pass-TwoU16s.rs b/src/test/ui/run-pass/extern/extern-pass-TwoU16s.rs
index 0cd8891cbe69..042c27d0902a 100644
--- a/src/test/ui/run-pass/extern/extern-pass-TwoU16s.rs
+++ b/src/test/ui/run-pass/extern/extern-pass-TwoU16s.rs
@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc for ffi testing
 
 // Test a foreign function that accepts and returns a struct
diff --git a/src/test/ui/run-pass/extern/extern-pass-TwoU32s.rs b/src/test/ui/run-pass/extern/extern-pass-TwoU32s.rs
index 8d7653d1b02b..de1819a1fbd5 100644
--- a/src/test/ui/run-pass/extern/extern-pass-TwoU32s.rs
+++ b/src/test/ui/run-pass/extern/extern-pass-TwoU32s.rs
@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc for ffi testing
 
 // Test a foreign function that accepts and returns a struct
diff --git a/src/test/ui/run-pass/extern/extern-pass-TwoU64s.rs b/src/test/ui/run-pass/extern/extern-pass-TwoU64s.rs
index d53b828d4002..5e4b3823b145 100644
--- a/src/test/ui/run-pass/extern/extern-pass-TwoU64s.rs
+++ b/src/test/ui/run-pass/extern/extern-pass-TwoU64s.rs
@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc for ffi testing
 
 // Test a foreign function that accepts and returns a struct
diff --git a/src/test/ui/run-pass/extern/extern-pass-TwoU8s.rs b/src/test/ui/run-pass/extern/extern-pass-TwoU8s.rs
index 198634c1dc7e..affcf62af700 100644
--- a/src/test/ui/run-pass/extern/extern-pass-TwoU8s.rs
+++ b/src/test/ui/run-pass/extern/extern-pass-TwoU8s.rs
@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc for ffi testing
 
 // Test a foreign function that accepts and returns a struct
diff --git a/src/test/ui/run-pass/extern/extern-return-TwoU16s.rs b/src/test/ui/run-pass/extern/extern-return-TwoU16s.rs
index ac51116637f7..826b5083676e 100644
--- a/src/test/ui/run-pass/extern/extern-return-TwoU16s.rs
+++ b/src/test/ui/run-pass/extern/extern-return-TwoU16s.rs
@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc to test ffi with
 
 pub struct TwoU16s {
diff --git a/src/test/ui/run-pass/extern/extern-return-TwoU32s.rs b/src/test/ui/run-pass/extern/extern-return-TwoU32s.rs
index 6abbd7e289a8..15584f28d07a 100644
--- a/src/test/ui/run-pass/extern/extern-return-TwoU32s.rs
+++ b/src/test/ui/run-pass/extern/extern-return-TwoU32s.rs
@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc to test ffi with
 
 pub struct TwoU32s {
diff --git a/src/test/ui/run-pass/extern/extern-return-TwoU64s.rs b/src/test/ui/run-pass/extern/extern-return-TwoU64s.rs
index 9e392521f6fa..94378522a1b5 100644
--- a/src/test/ui/run-pass/extern/extern-return-TwoU64s.rs
+++ b/src/test/ui/run-pass/extern/extern-return-TwoU64s.rs
@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc to test ffi with
 
 pub struct TwoU64s {
diff --git a/src/test/ui/run-pass/extern/extern-return-TwoU8s.rs b/src/test/ui/run-pass/extern/extern-return-TwoU8s.rs
index 720b1751e5a2..a66098c97747 100644
--- a/src/test/ui/run-pass/extern/extern-return-TwoU8s.rs
+++ b/src/test/ui/run-pass/extern/extern-return-TwoU8s.rs
@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc to test ffi with
 
 pub struct TwoU8s {
diff --git a/src/test/ui/run-pass/foreign/foreign-fn-with-byval.rs b/src/test/ui/run-pass/foreign/foreign-fn-with-byval.rs
index 14426fabaa5d..1c8d1bd2566d 100644
--- a/src/test/ui/run-pass/foreign/foreign-fn-with-byval.rs
+++ b/src/test/ui/run-pass/foreign/foreign-fn-with-byval.rs
@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc to test ffi with
 
 #[derive(Copy, Clone)]
diff --git a/src/test/ui/run-pass/issues/issue-3656.rs b/src/test/ui/run-pass/issues/issue-3656.rs
index 3807b369ce28..1e626e2e9c1f 100644
--- a/src/test/ui/run-pass/issues/issue-3656.rs
+++ b/src/test/ui/run-pass/issues/issue-3656.rs
@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // Issue #3656
 // Incorrect struct size computation in the FFI, because of not taking
 // the alignment of elements into account.
diff --git a/src/test/ui/run-pass/issues/issue-5754.rs b/src/test/ui/run-pass/issues/issue-5754.rs
index 7933c44932f9..ba79c32a83de 100644
--- a/src/test/ui/run-pass/issues/issue-5754.rs
+++ b/src/test/ui/run-pass/issues/issue-5754.rs
@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // pretty-expanded FIXME #23616
 
 struct TwoDoubles {
diff --git a/src/test/ui/run-pass/issues/issue-6470.rs b/src/test/ui/run-pass/issues/issue-6470.rs
index 6803ee6357b3..152b4bbedc3f 100644
--- a/src/test/ui/run-pass/issues/issue-6470.rs
+++ b/src/test/ui/run-pass/issues/issue-6470.rs
@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // pretty-expanded FIXME #23616
 #![allow(non_snake_case)]