diff --git a/library/x509_csr.c b/library/x509_csr.c
index 9b58a86..283f69d 100644
--- a/library/x509_csr.c
+++ b/library/x509_csr.c
@@ -332,8 +332,8 @@
 #endif /* MBEDTLS_FS_IO */
 
 #if !defined(MBEDTLS_X509_REMOVE_INFO)
-#define BEFORE_COLON    14
-#define BC              "14"
+#define BEFORE_COLON_CSR    14
+#define BC_CSR              "14"
 /*
  * Return an informational string about the CSR.
  */
@@ -343,7 +343,7 @@
     int ret;
     size_t n;
     char *p;
-    char key_size_str[BEFORE_COLON];
+    char key_size_str[BEFORE_COLON_CSR];
 
     p = buf;
     n = size;
@@ -364,13 +364,13 @@
                                      csr->sig_md, csr->sig_opts );
     MBEDTLS_X509_SAFE_SNPRINTF;
 
-    if( ( ret = mbedtls_x509_key_size_helper( key_size_str, BEFORE_COLON,
+    if( ( ret = mbedtls_x509_key_size_helper( key_size_str, BEFORE_COLON_CSR,
                                       mbedtls_pk_get_name( &csr->pk ) ) ) != 0 )
     {
         return( ret );
     }
 
-    ret = mbedtls_snprintf( p, n, "\n%s%-" BC "s: %d bits\n", prefix, key_size_str,
+    ret = mbedtls_snprintf( p, n, "\n%s%-" BC_CSR "s: %d bits\n", prefix, key_size_str,
                           (int) mbedtls_pk_get_bitlen( &csr->pk ) );
     MBEDTLS_X509_SAFE_SNPRINTF;