diff --git a/programs/x509/crl_app.c b/programs/x509/crl_app.c
index f06987c..d74a488 100644
--- a/programs/x509/crl_app.c
+++ b/programs/x509/crl_app.c
@@ -70,7 +70,7 @@
      */
     mbedtls_x509_crl_init(&crl);
 
-    if (argc == 0) {
+    if (argc < 2) {
 usage:
         mbedtls_printf(USAGE);
         goto exit;