diff --git a/core/buffered_reader.go b/core/buffered_reader.go
index fce3d119a..508f1438d 100644
--- a/core/buffered_reader.go
+++ b/core/buffered_reader.go
@@ -13,11 +13,9 @@ type (
 	}
 )
 
-func MakeBufferedReader(rd io.Reader, hash uint32) *BufferedReader {
-	res := &BufferedReader{bufio.NewReader(rd), hash}
-	if hash == 0 {
-		res.hash = HashPtr(uintptr(unsafe.Pointer(res)))
-	}
+func MakeBufferedReader(rd io.Reader) *BufferedReader {
+	res := &BufferedReader{bufio.NewReader(rd), 0}
+	res.hash = HashPtr(uintptr(unsafe.Pointer(res)))
 	return res
 }
 
diff --git a/core/environment.go b/core/environment.go
index 6fb2adf14..95eb67419 100644
--- a/core/environment.go
+++ b/core/environment.go
@@ -72,10 +72,6 @@ func (env *Env) SetClassPath(cp string) {
 	env.classPath.Value = cpVec
 }
 
-const stdinHashValue uint32 = 0x1fc542bb
-const stdoutHashValue uint32 = 0xef3ebf05
-const stderrHashValue uint32 = 0xbfa32704
-
 func NewEnv(currentNs Symbol, stdin io.Reader, stdout io.Writer, stderr io.Writer) *Env {
 	features := EmptySet()
 	features.Add(MakeKeyword("default"))
@@ -91,11 +87,11 @@ func NewEnv(currentNs Symbol, stdin io.Reader, stdout io.Writer, stderr io.Write
 	res.ns = res.CoreNamespace.Intern(MakeSymbol("*ns*"))
 	res.ns.Value = res.EnsureNamespace(currentNs)
 	res.stdin = res.CoreNamespace.Intern(MakeSymbol("*in*"))
-	res.stdin.Value = MakeBufferedReader(stdin, stdinHashValue)
+	res.stdin.Value = MakeBufferedReader(stdin)
 	res.stdout = res.CoreNamespace.Intern(MakeSymbol("*out*"))
-	res.stdout.Value = MakeIOWriter(stdout, stdoutHashValue)
+	res.stdout.Value = MakeIOWriter(stdout)
 	res.stderr = res.CoreNamespace.Intern(MakeSymbol("*err*"))
-	res.stderr.Value = MakeIOWriter(stderr, stderrHashValue)
+	res.stderr.Value = MakeIOWriter(stderr)
 	res.file = res.CoreNamespace.Intern(MakeSymbol("*file*"))
 	res.MainFile = res.CoreNamespace.Intern(MakeSymbol("*main-file*"))
 	res.version = res.CoreNamespace.InternVar("*joker-version*", versionMap(),
diff --git a/core/io_writer.go b/core/io_writer.go
index d45da1162..69f0ad48e 100644
--- a/core/io_writer.go
+++ b/core/io_writer.go
@@ -12,11 +12,9 @@ type (
 	}
 )
 
-func MakeIOWriter(w io.Writer, hash uint32) *IOWriter {
-	res := &IOWriter{w, hash}
-	if hash == 0 {
-		res.hash = HashPtr(uintptr(unsafe.Pointer(res)))
-	}
+func MakeIOWriter(w io.Writer) *IOWriter {
+	res := &IOWriter{w, 0}
+	res.hash = HashPtr(uintptr(unsafe.Pointer(res)))
 	return res
 }
 
diff --git a/core/procs.go b/core/procs.go
index 5f0a798cc..71e2aad3f 100644
--- a/core/procs.go
+++ b/core/procs.go
@@ -1344,7 +1344,7 @@ var procBuffer Proc = func(args []Object) Object {
 var procBufferedReader Proc = func(args []Object) Object {
 	switch rdr := args[0].(type) {
 	case io.Reader:
-		return MakeBufferedReader(rdr, 0)
+		return MakeBufferedReader(rdr)
 	default:
 		panic(RT.NewArgTypeError(0, args[0], "IOReader"))
 	}
diff --git a/main.go b/main.go
index 9f437423f..f069b111d 100644
--- a/main.go
+++ b/main.go
@@ -196,8 +196,8 @@ func srepl(port string, phase Phase) {
 	Stdin = conn
 	Stdout = conn
 	Stderr = conn
-	newIn := MakeBufferedReader(conn, 0)
-	newOut := MakeIOWriter(conn, 0)
+	newIn := MakeBufferedReader(conn)
+	newOut := MakeIOWriter(conn)
 	GLOBAL_ENV.SetStdIO(newIn, newOut, newOut)
 	defer func() {
 		conn.Close()
diff --git a/tests/eval/hash.joke b/tests/eval/hash.joke
index a23d75339..5b8f3527e 100644
--- a/tests/eval/hash.joke
+++ b/tests/eval/hash.joke
@@ -16,8 +16,4 @@
     (is (= (hash :hey) 819820356))
     (is (= (hash :there) 1648208352))
     (is (= (hash ::you) 3944753178))
-    (is (= (hash :user/foo) 1616868817)))
-  (testing "stable stdio hashes"
-    (is (= (hash *in*) 533021371))
-    (is (= (hash *out*) 4013866757))
-    (is (= (hash *err*) 3215140612))))
+    (is (= (hash :user/foo) 1616868817))))