diff --git a/crypto/Makefile.am b/crypto/Makefile.am
index 811946a..cf611a2 100644
--- a/crypto/Makefile.am
+++ b/crypto/Makefile.am
@@ -721,6 +721,9 @@ noinst_HEADERS += gost/gost_local.h
 
 # hidden
 noinst_HEADERS += hidden/crypto_namespace.h
+noinst_HEADERS += hidden/openssl/asn1.h
+noinst_HEADERS += hidden/openssl/asn1t.h
+noinst_HEADERS += hidden/openssl/bio.h
 noinst_HEADERS += hidden/openssl/chacha.h
 noinst_HEADERS += hidden/openssl/hmac.h
 noinst_HEADERS += hidden/openssl/pkcs12.h