diff --git a/tests/compiletest.rs b/tests/compiletest.rs
index 16311d0749b3..9394084ad34d 100644
--- a/tests/compiletest.rs
+++ b/tests/compiletest.rs
@@ -68,7 +68,7 @@ fn compile_fail(path: &str, target: &str, opt: bool) {
     run_tests("compile-fail", path, target, flags);
 }
 
-fn miri_pass(path: &str, target: &str, opt: bool, noseed: bool) {
+fn miri_pass(path: &str, target: &str, opt: bool) {
     let opt_str = if opt { " with optimizations" } else { "" };
     eprintln!("{}", format!(
         "## Running run-pass tests in {} against miri for target {}{}",
@@ -80,9 +80,6 @@ fn miri_pass(path: &str, target: &str, opt: bool, noseed: bool) {
     let mut flags = Vec::new();
     if opt {
         flags.push("-Zmir-opt-level=3".to_owned());
-    } else if !noseed {
-        // Run with intptrcast.  Avoid test matrix explosion by doing either this or opt-level=3.
-        flags.push("-Zmiri-seed=".to_owned());
     }
 
     run_tests("ui", path, target, flags);
@@ -106,8 +103,7 @@ fn get_target() -> String {
 }
 
 fn run_pass_miri(opt: bool) {
-    miri_pass("tests/run-pass", &get_target(), opt, false);
-    miri_pass("tests/run-pass-noseed", &get_target(), opt, true);
+    miri_pass("tests/run-pass", &get_target(), opt);
 }
 
 fn compile_fail_miri(opt: bool) {
diff --git a/tests/run-pass-noseed/hashmap.rs b/tests/run-pass/hashmap.rs
similarity index 95%
rename from tests/run-pass-noseed/hashmap.rs
rename to tests/run-pass/hashmap.rs
index e249238d48cb..1ff9c26ba18c 100644
--- a/tests/run-pass-noseed/hashmap.rs
+++ b/tests/run-pass/hashmap.rs
@@ -1,5 +1,3 @@
-// compile-flags: -Zmiri-seed=0000000000000000
-
 use std::collections::{self, HashMap};
 use std::hash::{BuildHasherDefault, BuildHasher};
 
diff --git a/tests/run-pass-noseed/heap_allocator.rs b/tests/run-pass/heap_allocator.rs
similarity index 99%
rename from tests/run-pass-noseed/heap_allocator.rs
rename to tests/run-pass/heap_allocator.rs
index e7a609a7d98e..7bcb08058c36 100644
--- a/tests/run-pass-noseed/heap_allocator.rs
+++ b/tests/run-pass/heap_allocator.rs
@@ -1,4 +1,3 @@
-// compile-flags: -Zmiri-seed=
 #![feature(allocator_api)]
 
 use std::ptr::NonNull;
diff --git a/tests/run-pass-noseed/intptrcast.rs b/tests/run-pass/intptrcast.rs
similarity index 94%
rename from tests/run-pass-noseed/intptrcast.rs
rename to tests/run-pass/intptrcast.rs
index 1b5251c91119..c28958b872de 100644
--- a/tests/run-pass-noseed/intptrcast.rs
+++ b/tests/run-pass/intptrcast.rs
@@ -1,5 +1,3 @@
-// compile-flags: -Zmiri-seed=0000000000000000
-
 // This returns a miri pointer at type usize, if the argument is a proper pointer
 fn transmute_ptr_to_int<T>(x: *const T) -> usize {
     unsafe { std::mem::transmute(x) }
diff --git a/tests/run-pass-noseed/malloc.rs b/tests/run-pass/malloc.rs
similarity index 97%
rename from tests/run-pass-noseed/malloc.rs
rename to tests/run-pass/malloc.rs
index bf51baacd35a..f66263425ee8 100644
--- a/tests/run-pass-noseed/malloc.rs
+++ b/tests/run-pass/malloc.rs
@@ -1,5 +1,4 @@
 //ignore-windows: Uses POSIX APIs
-//compile-flags: -Zmiri-seed=
 
 #![feature(rustc_private)]