diff --git a/Makefile b/Makefile
index 73007b4..fd60b5f 100644
--- a/Makefile
+++ b/Makefile
@@ -1427,7 +1427,7 @@
 
 ${FIPTOOL}: FORCE
 ifdef UNIX_MK
-	${Q}${MAKE} CPPFLAGS="-DVERSION='\"${VERSION_STRING}\"'" FIPTOOL=${FIPTOOL} --no-print-directory -C ${FIPTOOLPATH}
+	${Q}${MAKE} CPPFLAGS="-DVERSION='\"${VERSION_STRING}\"'" FIPTOOL=${FIPTOOL} OPENSSL_DIR=${OPENSSL_DIR} --no-print-directory -C ${FIPTOOLPATH}
 else
 # Clear the MAKEFLAGS as we do not want
 # to pass the gnumake flags to nmake.