diff --git a/src/cmd/gc/align.c b/src/cmd/gc/align.c
index 2d3756dfc26..36a33d48279 100644
--- a/src/cmd/gc/align.c
+++ b/src/cmd/gc/align.c
@@ -15,8 +15,8 @@
 
 static int defercalc;
 
-uint32
-rnd(uint32 o, uint32 r)
+vlong
+rnd(vlong o, vlong r)
 {
 	if(r < 1 || r > 8 || (r&(r-1)) != 0)
 		fatal("rnd");
diff --git a/src/cmd/gc/go.h b/src/cmd/gc/go.h
index 31fae5b19bd..f6bf8ef8c29 100644
--- a/src/cmd/gc/go.h
+++ b/src/cmd/gc/go.h
@@ -936,7 +936,7 @@ void	checkwidth(Type *t);
 void	defercheckwidth(void);
 void	dowidth(Type *t);
 void	resumecheckwidth(void);
-uint32	rnd(uint32 o, uint32 r);
+vlong	rnd(vlong o, vlong r);
 void	typeinit(void);
 
 /*
diff --git a/test/fixedbugs/bug458.go b/test/fixedbugs/bug458.go
new file mode 100644
index 00000000000..ddc97bdb0cc
--- /dev/null
+++ b/test/fixedbugs/bug458.go
@@ -0,0 +1,22 @@
+// compile
+
+// Copyright 2012 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Issue 4200: 6g crashes when a type is larger than 4GB.
+
+package main
+
+import "unsafe"
+
+// N=16 on 32-bit arches, 256 on 64-bit arches.
+// On 32-bit arches we don't want to test types
+// that are over 4GB large.
+const N = 1 << unsafe.Sizeof(uintptr(0))
+
+type T [N][10][10][10][10][3]byte
+
+func F(t *T) byte {
+	return t[0][0][0][0][0][0]
+}