diff --git a/src/netif/ppp/polarssl/README b/src/netif/ppp/polarssl/README
index c71cabb8..71f78fa9 100644
--- a/src/netif/ppp/polarssl/README
+++ b/src/netif/ppp/polarssl/README
@@ -15,10 +15,10 @@ library into lwIP:
 
 The following defines are available for flexibility:
 
-LWIP_INCLUDED_POLARSSL_MD4_C   ; Use lwIP internal PolarSSL for MD4
-LWIP_INCLUDED_POLARSSL_MD5_C   ; Use lwIP internal PolarSSL for MD5
-LWIP_INCLUDED_POLARSSL_SHA1_C  ; Use lwIP internal PolarSSL for SHA1
-LWIP_INCLUDED_POLARSSL_DES_C   ; Use lwIP internal PolarSSL for DES
+LWIP_INCLUDED_POLARSSL_MD4   ; Use lwIP internal PolarSSL for MD4
+LWIP_INCLUDED_POLARSSL_MD5   ; Use lwIP internal PolarSSL for MD5
+LWIP_INCLUDED_POLARSSL_SHA1  ; Use lwIP internal PolarSSL for SHA1
+LWIP_INCLUDED_POLARSSL_DES   ; Use lwIP internal PolarSSL for DES
 
 If set (=1), the default if required by another enabled PPP feature unless
 explicitly set to 0, using included lwIP PolarSSL.
diff --git a/src/netif/ppp/polarssl/des.c b/src/netif/ppp/polarssl/des.c
index ac23cbc2..76b10743 100644
--- a/src/netif/ppp/polarssl/des.c
+++ b/src/netif/ppp/polarssl/des.c
@@ -40,7 +40,7 @@
  */
 
 #include "lwip/opt.h"
-#if defined(LWIP_INCLUDED_POLARSSL_DES_C)
+#if LWIP_INCLUDED_POLARSSL_DES
 
 #include "polarssl/des.h"
 
@@ -419,4 +419,4 @@ void des_crypt_ecb( des_context *ctx,
     PUT_ULONG_BE( X, output, 4 );
 }
 
-#endif /* LWIP_INCLUDED_POLARSSL_DES_C */
+#endif /* LWIP_INCLUDED_POLARSSL_DES */
diff --git a/src/netif/ppp/polarssl/md4.c b/src/netif/ppp/polarssl/md4.c
index 3d8a8fda..5bbc1710 100644
--- a/src/netif/ppp/polarssl/md4.c
+++ b/src/netif/ppp/polarssl/md4.c
@@ -40,7 +40,7 @@
  */
 
 #include "lwip/opt.h"
-#if defined(LWIP_INCLUDED_POLARSSL_MD4_C)
+#if LWIP_INCLUDED_POLARSSL_MD4
 
 #include "polarssl/md4.h"
 
@@ -276,4 +276,4 @@ void md4( unsigned char *input, int ilen, unsigned char output[16] )
     md4_finish( &ctx, output );
 }
 
-#endif /* LWIP_INCLUDED_POLARSSL_MD4_C */
+#endif /* LWIP_INCLUDED_POLARSSL_MD4 */
diff --git a/src/netif/ppp/polarssl/md5.c b/src/netif/ppp/polarssl/md5.c
index a98e8289..bb124940 100644
--- a/src/netif/ppp/polarssl/md5.c
+++ b/src/netif/ppp/polarssl/md5.c
@@ -39,7 +39,7 @@
  */
 
 #include "lwip/opt.h"
-#if defined(LWIP_INCLUDED_POLARSSL_MD5_C)
+#if LWIP_INCLUDED_POLARSSL_MD5
 
 #include "polarssl/md5.h"
 
@@ -295,4 +295,4 @@ void md5( unsigned char *input, int ilen, unsigned char output[16] )
     md5_finish( &ctx, output );
 }
 
-#endif /* LWIP_INCLUDED_POLARSSL_MD5_C */
+#endif /* LWIP_INCLUDED_POLARSSL_MD5 */
diff --git a/src/netif/ppp/polarssl/sha1.c b/src/netif/ppp/polarssl/sha1.c
index 6d6e682a..1fc51989 100644
--- a/src/netif/ppp/polarssl/sha1.c
+++ b/src/netif/ppp/polarssl/sha1.c
@@ -39,7 +39,7 @@
  */
 
 #include "lwip/opt.h"
-#if defined(LWIP_INCLUDED_POLARSSL_SHA1_C)
+#if LWIP_INCLUDED_POLARSSL_SHA1
 
 #include "polarssl/sha1.h"
 
@@ -330,4 +330,4 @@ void sha1( unsigned char *input, int ilen, unsigned char output[20] )
     sha1_finish( &ctx, output );
 }
 
-#endif /* LWIP_INCLUDED_POLARSSL_SHA1_C */
+#endif /* LWIP_INCLUDED_POLARSSL_SHA1 */