diff --git a/library/md.c b/library/md.c
index 303cdcb..b3525be 100644
--- a/library/md.c
+++ b/library/md.c
@@ -61,8 +61,10 @@
 
 #if defined(MBEDTLS_SHA256_C)
         MBEDTLS_MD_SHA256,
+#if !defined(MBEDTLS_SHA256_NO_SHA224)
         MBEDTLS_MD_SHA224,
 #endif
+#endif /* MBEDTLS_SHA256_C */
 
 #if defined(MBEDTLS_SHA1_C)
         MBEDTLS_MD_SHA1,
@@ -119,11 +121,13 @@
         return mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 );
 #endif
 #if defined(MBEDTLS_SHA256_C)
+#if !defined(MBEDTLS_SHA256_NO_SHA224)
     if( !strcmp( "SHA224", md_name ) )
         return mbedtls_md_info_from_type( MBEDTLS_MD_SHA224 );
+#endif
     if( !strcmp( "SHA256", md_name ) )
         return mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 );
-#endif
+#endif /* MBEDTLS_SHA256_C */
 #if defined(MBEDTLS_SHA512_C)
     if( !strcmp( "SHA384", md_name ) )
         return mbedtls_md_info_from_type( MBEDTLS_MD_SHA384 );
@@ -158,11 +162,13 @@
             return( &mbedtls_sha1_info );
 #endif
 #if defined(MBEDTLS_SHA256_C)
+#if !defined(MBEDTLS_SHA256_NO_SHA224)
         case MBEDTLS_MD_SHA224:
             return( &mbedtls_sha224_info );
+#endif
         case MBEDTLS_MD_SHA256:
             return( &mbedtls_sha256_info );
-#endif
+#endif /* MBEDTLS_SHA256_C */
 #if defined(MBEDTLS_SHA512_C)
         case MBEDTLS_MD_SHA384:
             return( &mbedtls_sha384_info );