diff --git a/Makefile b/Makefile
index 939ac7ae..b15ac320 100644
--- a/Makefile
+++ b/Makefile
@@ -53,6 +53,10 @@ INSTALL = /usr/ucb/install
 RM = /usr/bin/rm -f
 endif
 
+ifeq ($(OSTYPE),OpenBSD)
+LIBS += -lcrypto
+endif
+
 ifeq ($(OSTYPE),Darwin)
 OSTYPE=darwin
 endif