diff --git a/crypto/Makefile.am b/crypto/Makefile.am
index ec207e8..7e91a64 100644
--- a/crypto/Makefile.am
+++ b/crypto/Makefile.am
@@ -748,6 +748,7 @@ noinst_HEADERS += hidden/openssl/idea.h
 noinst_HEADERS += hidden/openssl/lhash.h
 noinst_HEADERS += hidden/openssl/md4.h
 noinst_HEADERS += hidden/openssl/md5.h
+noinst_HEADERS += hidden/openssl/modes.h
 noinst_HEADERS += hidden/openssl/objects.h
 noinst_HEADERS += hidden/openssl/ocsp.h
 noinst_HEADERS += hidden/openssl/pem.h