diff --git a/crypto/Makefile.am b/crypto/Makefile.am
index b7f4891..f60fe57 100644
--- a/crypto/Makefile.am
+++ b/crypto/Makefile.am
@@ -3,6 +3,7 @@ include $(top_srcdir)/Makefile.am.common
 AM_CPPFLAGS += -I$(top_srcdir)/crypto/asn1
 AM_CPPFLAGS += -I$(top_srcdir)/crypto/evp
 AM_CPPFLAGS += -I$(top_srcdir)/crypto/modes
+AM_CPPFLAGS += -I$(top_srcdir)/crypto
 
 lib_LTLIBRARIES = libcrypto.la
 
@@ -128,6 +129,7 @@ libcrypto_la_SOURCES += mem_dbg.c
 libcrypto_la_SOURCES += o_init.c
 libcrypto_la_SOURCES += o_str.c
 libcrypto_la_SOURCES += o_time.c
+noinst_HEADERS += constant_time_locl.h
 noinst_HEADERS += cryptlib.h
 noinst_HEADERS += md32_common.h
 noinst_HEADERS += o_time.h