diff --git a/boring-sys/build.rs b/boring-sys/build.rs
index cd2161ba..ac916307 100644
--- a/boring-sys/build.rs
+++ b/boring-sys/build.rs
@@ -680,6 +680,7 @@ fn main() {
         "des.h",
         "dtls1.h",
         "hkdf.h",
+        "hmac.h",
         "hrss.h",
         "md4.h",
         "md5.h",