diff --git a/Makefile.inc b/Makefile.inc
index 3b8c8ab..658b1d6 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -2,10 +2,10 @@ CSOURCES = channel.c comp.c crypt.c hostkey.c kex.c mac.c misc.c \
  packet.c publickey.c scp.c session.c sftp.c userauth.c transport.c \
  version.c knownhost.c
 
-if LIBGCRYPT
+ifdef LIBGCRYPT
 CSOURCES += libgcrypt.c pem.c
 else
 CSOURCES += openssl.c
 endif
 
-HHEADERS = libssh2_priv.h openssl.h libgcrypt.h transport.h channel.h comp.h mac.h misc.h
\ No newline at end of file
+HHEADERS = libssh2_priv.h openssl.h libgcrypt.h transport.h channel.h comp.h mac.h misc.h