diff --git a/programs/x509/cert_app.c b/programs/x509/cert_app.c
index 04fd325..ce58ab2 100644
--- a/programs/x509/cert_app.c
+++ b/programs/x509/cert_app.c
@@ -159,6 +159,7 @@
      * Set to sane values
      */
     server_fd = 0;
+    mbedtls_ctr_drbg_init( &ctr_drbg );
     mbedtls_x509_crt_init( &cacert );
     mbedtls_x509_crt_init( &clicert );
 #if defined(MBEDTLS_X509_CRL_PARSE_C)
@@ -365,11 +366,11 @@
         fflush( stdout );
 
         mbedtls_entropy_init( &entropy );
-        if( ( ret = mbedtls_ctr_drbg_init( &ctr_drbg, mbedtls_entropy_func, &entropy,
+        if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
                                    (const unsigned char *) pers,
                                    strlen( pers ) ) ) != 0 )
         {
-            mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_init returned %d\n", ret );
+            mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", ret );
             goto exit;
         }