diff --git a/crypto/bn/Makefile.ssl b/crypto/bn/Makefile.ssl
index 29ca88ccd57fbbaf065ae7c5aa2c136aa6b498ec..3902c41c72225a24fc978d4d5e775beabf2074bf 100644
--- a/crypto/bn/Makefile.ssl
+++ b/crypto/bn/Makefile.ssl
@@ -5,6 +5,7 @@
 DIR=	bn
 TOP=	../..
 CC=	cc
+CPP=    $(CC) -E
 INCLUDES= -I.. -I../../include
 CFLAG=-g
 INSTALL_PREFIX=
diff --git a/crypto/rc4/Makefile.ssl b/crypto/rc4/Makefile.ssl
index d3dff0f4a13ea3680a6f7f26d6b3d0d7586c53d8..53eac2064a4c7525a5dcd2e3e31d11f5ba0289c4 100644
--- a/crypto/rc4/Makefile.ssl
+++ b/crypto/rc4/Makefile.ssl
@@ -5,6 +5,7 @@
 DIR=	rc4
 TOP=	../..
 CC=	cc
+CPP=    $(CC) -E
 INCLUDES=
 CFLAG=-g
 INSTALL_PREFIX=
diff --git a/crypto/sha/Makefile.ssl b/crypto/sha/Makefile.ssl
index d30e7244c04466b1c1037bc6a9871381c2f7de93..0e6e7b8940c62b292f028fa4df4d3fb3b542b195 100644
--- a/crypto/sha/Makefile.ssl
+++ b/crypto/sha/Makefile.ssl
@@ -5,6 +5,7 @@
 DIR=    sha
 TOP=    ../..
 CC=     cc
+CPP=    $(CC) -E
 INCLUDES=
 CFLAG=-g
 INSTALL_PREFIX=