diff --git a/tests/filter_libc b/tests/filter_libc

index 5d8e0ac..9a508b0 100755

--- a/tests/filter_libc

+++ b/tests/filter_libc

@@ -36,6 +36,9 @@ while (<>)

     s/(at.*)__builtin_vec_delete/$1...operator delete[].../;

     s/(at.*)operator delete\[\]\(void\*\)/$1...operator delete[].../;

+    # Some glibc versions complain about unexpected futex syscall errors.

+    s/The futex facility returned an unexpected error code.//;

+

     print;

 }