diff --git a/components/profile/lib.rs b/components/profile/lib.rs
index 08971cb3e0f..ed54b593adb 100644
--- a/components/profile/lib.rs
+++ b/components/profile/lib.rs
@@ -4,7 +4,6 @@
 
 #![feature(box_syntax)]
 #![feature(iter_arith)]
-#![cfg_attr(target_os="linux", feature(page_size))]
 #![feature(slice_splits)]
 
 #[macro_use] extern crate log;
diff --git a/components/profile/mem.rs b/components/profile/mem.rs
index ff9a19ecc36..34254e83bbd 100644
--- a/components/profile/mem.rs
+++ b/components/profile/mem.rs
@@ -436,6 +436,13 @@ mod system_reporter {
         ($e:expr) => (match $e { Some(e) => e, None => return None })
     );
 
+    #[cfg(target_os="linux")]
+    fn page_size() -> usize {
+        unsafe {
+            ::libc::sysconf(::libc::_SC_PAGESIZE) as usize
+        }
+    }
+
     #[cfg(target_os="linux")]
     fn get_proc_self_statm_field(field: usize) -> Option<usize> {
         use std::fs::File;
@@ -446,7 +453,7 @@ mod system_reporter {
         option_try!(f.read_to_string(&mut contents).ok());
         let s = option_try!(contents.split_whitespace().nth(field));
         let npages = option_try!(s.parse::<usize>().ok());
-        Some(npages * ::std::env::page_size())
+        Some(npages * page_size())
     }
 
     #[cfg(target_os="linux")]