diff --git a/libc-test/build.rs b/libc-test/build.rs
index 50082d8e2f68a292a20d8b5e7a48bc597541ee25..84f4ab825b5b4af0dcf6e1da280075db936fa390 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -1648,6 +1648,7 @@ fn test_freebsd(target: &str) {
                 "ufs/ufs/quota.h",
                 "unistd.h",
                 "utime.h",
+                "utmpx.h",
                 "wchar.h",
     }