diff --git a/crypto/Makefile.am b/crypto/Makefile.am
index a5a9bbd..50eb8f7 100644
--- a/crypto/Makefile.am
+++ b/crypto/Makefile.am
@@ -755,6 +755,7 @@ noinst_HEADERS += hidden/openssl/sm3.h
 noinst_HEADERS += hidden/openssl/sm4.h
 noinst_HEADERS += hidden/openssl/stack.h
 noinst_HEADERS += hidden/openssl/ts.h
+noinst_HEADERS += hidden/openssl/txt_db.h
 noinst_HEADERS += hidden/openssl/ui.h
 noinst_HEADERS += hidden/openssl/x509.h
 noinst_HEADERS += hidden/openssl/x509_vfy.h