diff --git a/src/rt/rust_builtin.cpp b/src/rt/rust_builtin.cpp
index 4bf51da214bfcaa64b09e0122be2d89a961caf33..89d8c6d12f2f3978799ca46d3268eb997ad98af5 100644
--- a/src/rt/rust_builtin.cpp
+++ b/src/rt/rust_builtin.cpp
@@ -445,13 +445,6 @@ migrate_alloc(void *alloc, rust_task_id tid) {
     }
 }
 
-// defined in rust_task.cpp
-extern size_t g_custom_min_stack_size;
-extern "C" CDECL void
-set_min_stack(uintptr_t stack_size) {
-    g_custom_min_stack_size = stack_size;
-}
-
 extern "C" CDECL int
 sched_threads() {
     rust_task *task = rust_scheduler::get_task();
diff --git a/src/rt/rust_task.cpp b/src/rt/rust_task.cpp
index d6f43ca079435aeb69f6e05a1ce3cfb543b41af8..1bf62e42f014db85fcedc717bdcfdbf58b1943f8 100644
--- a/src/rt/rust_task.cpp
+++ b/src/rt/rust_task.cpp
@@ -65,18 +65,6 @@ const uint8_t stack_canary[] = {0xAB, 0xCD, 0xAB, 0xCD,
                                 0xAB, 0xCD, 0xAB, 0xCD,
                                 0xAB, 0xCD, 0xAB, 0xCD};
 
-// Stack size
-size_t g_custom_min_stack_size = 0;
-
-static size_t
-get_min_stk_size(size_t default_size) {
-    if (g_custom_min_stack_size != 0) {
-        return g_custom_min_stack_size;
-    } else {
-        return default_size;
-    }
-}
-
 static size_t
 get_next_stk_size(rust_scheduler *sched, rust_task *task,
                   size_t min, size_t current, size_t requested) {
@@ -157,7 +145,7 @@ new_stk(rust_scheduler *sched, rust_task *task, size_t requested_sz)
     }
 
     // The minimum stack size, in bytes, of a Rust stack, excluding red zone
-    size_t min_sz = get_min_stk_size(sched->min_stack_size);
+    size_t min_sz = sched->min_stack_size;
 
     // Try to reuse an existing stack segment
     if (task->stk != NULL && task->stk->prev != NULL) {
diff --git a/src/rt/rustrt.def.in b/src/rt/rustrt.def.in
index 052f4a42779cd4405cec886ae21c03322d2ec73a..50981882ecd321e8923b4d76819ef49259347906 100644
--- a/src/rt/rustrt.def.in
+++ b/src/rt/rustrt.def.in
@@ -49,7 +49,6 @@ rust_getcwd
 rust_task_is_unwinding
 rust_task_sleep
 rust_get_task
-set_min_stack
 sched_threads
 shape_log_str
 squareroot
diff --git a/src/test/run-fail/morestack4.rs b/src/test/run-fail/morestack4.rs
index b36372d74e1ced0a278367394c627d69ba8685ea..8f0ccec560f7164bf4ab6e15ac0a503f863bff56 100644
--- a/src/test/run-fail/morestack4.rs
+++ b/src/test/run-fail/morestack4.rs
@@ -4,10 +4,6 @@
 
 use std;
 
-native mod rustrt {
-    fn set_min_stack(size: uint);
-}
-
 fn getbig_and_fail(&&i: int) {
     let r = and_then_get_big_again(@0);
     if i != 0 {
@@ -21,7 +17,6 @@ fn getbig_and_fail(&&i: int) {
 }
 
 fn main() {
-    rustrt::set_min_stack(256u);
     task::spawn {||
         getbig_and_fail(1);
     };
diff --git a/src/test/run-pass/morestack5.rs b/src/test/run-pass/morestack5.rs
index 6c1d906e1e6cfcbfcbf87fdaef04f445801aea96..ecd187ae44ad44944086d15356a0e5645f31917d 100644
--- a/src/test/run-pass/morestack5.rs
+++ b/src/test/run-pass/morestack5.rs
@@ -3,10 +3,6 @@
 use std;
 import task;
 
-native mod rustrt {
-    fn set_min_stack(size: uint);
-}
-
 fn getbig(&&i: int) {
     if i != 0 {
         getbig(i - 1);
@@ -16,7 +12,6 @@ fn getbig(&&i: int) {
 fn main() {
     let sz = 400u;
     while sz < 500u {
-        rustrt::set_min_stack(sz);
         task::join(task::spawn_joinable {|| getbig(200) });
         sz += 1u;
     }
diff --git a/src/test/run-pass/morestack6.rs b/src/test/run-pass/morestack6.rs
index 2e30b942c1e4097432025d75bb7c986a877b7d54..66954c29d9835b3bf38a2754b0761e6892aebe5f 100644
--- a/src/test/run-pass/morestack6.rs
+++ b/src/test/run-pass/morestack6.rs
@@ -6,7 +6,6 @@
 import std::rand;
 
 native mod rustrt {
-    fn set_min_stack(size: uint);
     fn debug_get_stk_seg() -> *u8;
 
     fn unsupervise();
@@ -71,7 +70,6 @@ fn main() {
     for f in fns {
         let sz = rng.next() % 256u32 + 256u32;
         let frame_backoff = rng.next() % 10u32 + 1u32;
-        rustrt::set_min_stack(sz as uint);
         task::join(task::spawn_joinable {|| runtest(f, frame_backoff);});
     }
 }
\ No newline at end of file