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

index 9607db5..8eb9911 100755

--- a/tests/filter_libc

+++ b/tests/filter_libc

@@ -37,6 +37,8 @@ while (<>)

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

     # Some glibc versions complain about unexpected futex syscall errors.

+    # With or without newline (see sourceware PR20271).

+    next if /^The futex facility returned an unexpected error code.$/;

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

     print;