diff --git a/src/test/run-pass-valgrind/cast-enum-with-dtor.rs b/src/test/run-pass-valgrind/cast-enum-with-dtor.rs
index b13e34256d2..247e82c2f09 100644
--- a/src/test/run-pass-valgrind/cast-enum-with-dtor.rs
+++ b/src/test/run-pass-valgrind/cast-enum-with-dtor.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// no-prefer-dynamic
+
 #![allow(dead_code)]
 #![feature(const_fn)]
 
diff --git a/src/test/run-pass-valgrind/cleanup-auto-borrow-obj.rs b/src/test/run-pass-valgrind/cleanup-auto-borrow-obj.rs
index 0bbb9ed1285..220968529de 100644
--- a/src/test/run-pass-valgrind/cleanup-auto-borrow-obj.rs
+++ b/src/test/run-pass-valgrind/cleanup-auto-borrow-obj.rs
@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// no-prefer-dynamic
 
 // This would previously leak the Box<Trait> because we wouldn't
 // schedule cleanups when auto borrowing trait objects.
diff --git a/src/test/run-pass-valgrind/cleanup-stdin.rs b/src/test/run-pass-valgrind/cleanup-stdin.rs
index dcdce50c1e9..b7c94ed6944 100644
--- a/src/test/run-pass-valgrind/cleanup-stdin.rs
+++ b/src/test/run-pass-valgrind/cleanup-stdin.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// no-prefer-dynamic
+
 fn main() {
     let _ = std::io::stdin();
     let _ = std::io::stdout();
diff --git a/src/test/run-pass-valgrind/dst-dtor-1.rs b/src/test/run-pass-valgrind/dst-dtor-1.rs
index d051b7b491b..995da8c73fa 100644
--- a/src/test/run-pass-valgrind/dst-dtor-1.rs
+++ b/src/test/run-pass-valgrind/dst-dtor-1.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// no-prefer-dynamic
+
 static mut DROP_RAN: bool = false;
 
 struct Foo;
diff --git a/src/test/run-pass-valgrind/dst-dtor-2.rs b/src/test/run-pass-valgrind/dst-dtor-2.rs
index a89873b1277..471169340d7 100644
--- a/src/test/run-pass-valgrind/dst-dtor-2.rs
+++ b/src/test/run-pass-valgrind/dst-dtor-2.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// no-prefer-dynamic
+
 static mut DROP_RAN: isize = 0;
 
 struct Foo;
diff --git a/src/test/run-pass-valgrind/exit-flushes.rs b/src/test/run-pass-valgrind/exit-flushes.rs
index 632693dd728..1897b921401 100644
--- a/src/test/run-pass-valgrind/exit-flushes.rs
+++ b/src/test/run-pass-valgrind/exit-flushes.rs
@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// no-prefer-dynamic
 // ignore-macos this needs valgrind 3.11 or higher; see
 // https://github.com/rust-lang/rust/pull/30365#issuecomment-165763679
 
diff --git a/src/test/run-pass-valgrind/osx-frameworks.rs b/src/test/run-pass-valgrind/osx-frameworks.rs
index 41b34dc79bd..468a20db6f7 100644
--- a/src/test/run-pass-valgrind/osx-frameworks.rs
+++ b/src/test/run-pass-valgrind/osx-frameworks.rs
@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// no-prefer-dynamic
 // pretty-expanded FIXME #23616
 
 #![feature(libc)]