diff --git a/secure/lib/libcrypto/modules/fips/Makefile b/secure/lib/libcrypto/modules/fips/Makefile
--- a/secure/lib/libcrypto/modules/fips/Makefile
+++ b/secure/lib/libcrypto/modules/fips/Makefile
@@ -297,6 +297,8 @@
 # ssl
 SRCS+=	record/tls_pad.c s3_cbc.c
 
+LIBADD+=	pthread
+
 .include <bsd.lib.mk>
 
 .if defined(ASM_${MACHINE_CPUARCH})