diff --git a/src/lib/generic_os.rs b/src/lib/generic_os.rs
index 21c3dee5ef3..0fb8d79378f 100644
--- a/src/lib/generic_os.rs
+++ b/src/lib/generic_os.rs
@@ -1,53 +1,8 @@
 
 
-#[cfg(target_os = "linux")]
-#[cfg(target_os = "macos")]
 fn getenv(str n) -> option::t[str] {
     auto s = os::libc::getenv(str::buf(n));
     ret if (s as int == 0) {
             option::none[str]
         } else { option::some[str](str::str_from_cstr(s)) };
-}
-
-#[cfg(target_os = "linux")]
-#[cfg(target_os = "macos")]
-fn setenv(str n, str v) {
-    auto nbuf = str::buf(n);
-    auto vbuf = str::buf(v);
-    os::libc::setenv(nbuf, vbuf, 1);
-}
-
-#[cfg(target_os = "win32")]
-fn getenv(str n) -> option::t[str]{
-    auto nbuf = str::buf(n);
-    auto nsize = 256u;
-    while (true) {
-        auto vstr = str::alloc(nsize - 1u);
-        auto vbuf = str::buf(vstr);
-        auto res = os::rustrt::rust_GetEnvironmentVariable(nbuf, vbuf, nsize);
-        if (res == 0u) {
-            ret option::none;
-        } else if (res < nsize) {
-            ret option::some(str::str_from_cstr(vbuf));
-        } else {
-            nsize = res;
-        }
-    }
-    fail;
-}
-
-#[cfg(target_os = "win32")]
-fn setenv(str n, str v) {
-    auto nbuf = str::buf(n);
-    auto vbuf = str::buf(v);
-    os::rustrt::rust_SetEnvironmentVariable(nbuf, vbuf);
-}
-
-// Local Variables:
-// mode: rust;
-// fill-column: 78;
-// indent-tabs-mode: nil
-// c-basic-offset: 4
-// buffer-file-coding-system: utf-8-unix
-// compile-command: "make -k -C .. 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
-// End:
+}
\ No newline at end of file
diff --git a/src/lib/win32_os.rs b/src/lib/win32_os.rs
index 77cb2a9b9fd..25ad71cecab 100644
--- a/src/lib/win32_os.rs
+++ b/src/lib/win32_os.rs
@@ -18,6 +18,7 @@ native "cdecl" mod libc = "" {
     fn fwrite(vbuf buf, uint size, uint n, FILE f) -> uint;
     fn fseek(FILE f, int offset, int whence) -> int;
     fn ftell(FILE f) -> int;
+    fn getenv(sbuf n) -> sbuf;
     fn _pipe(*mutable int fds, uint size, int mode) -> int;
 }
 
@@ -66,8 +67,6 @@ fn fd_FILE(int fd) -> libc::FILE { ret libc::_fdopen(fd, str::buf("r")); }
 native "rust" mod rustrt {
     fn rust_process_wait(int handle) -> int;
     fn rust_getcwd() -> str;
-    fn rust_SetEnvironmentVariable(sbuf n, sbuf v) -> int;
-    fn rust_GetEnvironmentVariable(sbuf n, sbuf v, uint nsize) -> uint;
 }
 
 fn waitpid(int pid) -> int { ret rustrt::rust_process_wait(pid); }
diff --git a/src/rt/rust_builtin.cpp b/src/rt/rust_builtin.cpp
index 7e72b2e7ab6..df7b1cfc6d3 100644
--- a/src/rt/rust_builtin.cpp
+++ b/src/rt/rust_builtin.cpp
@@ -650,20 +650,6 @@ rust_ptr_eq(rust_task *task, type_desc *t, rust_box *a, rust_box *b) {
     return a == b;
 }
 
-#if defined(__WIN32__)
-extern "C" CDECL int32_t
-rust_SetEnvironmentVariable(rust_task *task,
-                            const char *name, const char *val) {
-     return SetEnvironmentVariable(name, val);
-}
-
-extern "C" CDECL uint32_t
-rust_GetEnvironmentVariable(rust_task *task,
-                            const char *name, char *buf, uint32_t size) {
-    return GetEnvironmentVariable(name, buf, size);
-}
-#endif
-
 #if defined(__WIN32__)
 extern "C" CDECL void
 get_time(rust_task *task, uint32_t *sec, uint32_t *usec) {
diff --git a/src/rt/rustrt.def.in b/src/rt/rustrt.def.in
index 9c0557729bf..f762f4a9be3 100644
--- a/src/rt/rustrt.def.in
+++ b/src/rt/rustrt.def.in
@@ -35,8 +35,6 @@ rust_ptr_eq
 rust_run_program
 rust_start
 rust_getcwd
-rust_SetEnvironmentVariable
-rust_GetEnvironmentVariable
 size_of
 squareroot
 str_alloc
diff --git a/src/test/run-pass/lib-os.rs b/src/test/run-pass/lib-os.rs
deleted file mode 100644
index c3dc3e08dad..00000000000
--- a/src/test/run-pass/lib-os.rs
+++ /dev/null
@@ -1,49 +0,0 @@
-// xfail-stage0
-
-use std;
-
-import std::generic_os::setenv;
-import std::generic_os::getenv;
-import std::option;
-
-#[test]
-fn test_setenv() {
-    setenv("NAME", "VALUE");
-    assert getenv("NAME") == option::some("VALUE");
-}
-
-#[test]
-fn test_setenv_overwrite() {
-    setenv("NAME", "1");
-    setenv("NAME", "2");
-    assert getenv("NAME") == option::some("2");
-}
-
-// Windows GetEnvironmentVariable requires some extra work to make sure
-// the buffer the variable is copied into is the right size
-#[test]
-fn test_getenv_big() {
-    auto s = "";
-    auto i = 0;
-    while (i < 100) {
-        s += "aaaaaaaaaa";
-        i += 1;
-    }
-    setenv("NAME", s);
-    assert getenv("NAME") == option::some(s);
-}
-
-fn main() {
-    test_setenv();
-    test_setenv_overwrite();
-    test_getenv_big();
-}
-
-// Local Variables:
-// mode: rust;
-// fill-column: 78;
-// indent-tabs-mode: nil
-// c-basic-offset: 4
-// buffer-file-coding-system: utf-8-unix
-// compile-command: "make -k -C .. 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
-// End: