diff --git a/crypto/Makefile b/crypto/Makefile
index 6167b7d568a591e8897537c3c7d7a0bb3a635650..e340afb276fde8d356b749282c3f337dca31152b 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -44,7 +44,8 @@ SRC= $(LIBSRC)
 
 EXHEADER= crypto.h opensslv.h opensslconf.h ebcdic.h symhacks.h \
 	ossl_typ.h
-HEADER=	cryptlib.h buildinf.h md32_common.h o_time.h o_str.h o_dir.h $(EXHEADER)
+HEADER=	cryptlib.h buildinf.h md32_common.h o_time.h o_str.h o_dir.h \
+	constant_time_locl.h $(EXHEADER)
 
 ALL=    $(GENERAL) $(SRC) $(HEADER)