diff --git a/src/test/run-pass/lib-io.rs b/src/test/run-pass/lib-io.rs
index ab9c309f98cc..d2fada74c175 100644
--- a/src/test/run-pass/lib-io.rs
+++ b/src/test/run-pass/lib-io.rs
@@ -4,6 +4,8 @@ use std;
 import std::io;
 import std::str;
 
+#[cfg(target_os = "linux")]
+#[cfg(target_os = "win32")]
 fn test_simple() {
     let str tmpfile = "test/run-pass/lib-io-test-simple.tmp";
     log tmpfile;
@@ -20,6 +22,10 @@ fn test_simple() {
     assert (str::eq(frood, frood2));
 }
 
+// FIXME (726)
+#[cfg(target_os = "macos")]
+fn test_simple() {}
+
 fn main() {
     test_simple();
 }
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