diff --git a/src/test/run-pass/command-before-exec.rs b/src/test/run-pass/command-before-exec.rs
index 16560637b692667da1e96c0588ec638c1d1f29f7..7c5a21911dbfb45c985da3fcd569352f67e856b9 100644
--- a/src/test/run-pass/command-before-exec.rs
+++ b/src/test/run-pass/command-before-exec.rs
@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // ignore-windows - this is a unix-specific test
+// no-prefer-dynamic - this test breaks with dynamic linking as
+// some LD_LIBRARY_PATH entries are relative and it cd's to /.
 
 #![feature(process_exec, libc)]