diff --git a/programs/pkey/gen_key.c b/programs/pkey/gen_key.c
index ac6ed94..1a6463d 100644
--- a/programs/pkey/gen_key.c
+++ b/programs/pkey/gen_key.c
@@ -204,7 +204,7 @@
     mbedtls_ctr_drbg_init(&ctr_drbg);
     memset(buf, 0, sizeof(buf));
 
-    if (argc == 0) {
+    if (argc < 2) {
 usage:
         mbedtls_printf(USAGE);
 #if defined(MBEDTLS_ECP_C)