diff --git a/library/x509_csr.c b/library/x509_csr.c
index 5463f8a..0a5d2cb 100644
--- a/library/x509_csr.c
+++ b/library/x509_csr.c
@@ -323,6 +323,7 @@
 }
 #endif /* MBEDTLS_FS_IO */
 
+#if defined(MBEDTLS_X509_INFO)
 #define BEFORE_COLON    14
 #define BC              "14"
 /*
@@ -367,6 +368,7 @@
 
     return( (int) ( size - n ) );
 }
+#endif /* MBEDTLS_X509_INFO */
 
 /*
  * Initialize a CSR