1 files changed, 4 insertions, 0 deletions
diff --git a/utils/print_roa/print_roa.c b/utils/print_roa/print_roa.c
index 42f03c8f..efe76674 100644
--- a/utils/print_roa/print_roa.c
+++ b/utils/print_roa/print_roa.c
@@ -307,6 +307,10 @@ int main (int argc, char *argv[])
   int result = 0;
   OpenSSL_add_all_algorithms();
   ERR_load_crypto_strings();
+  if (argc < 2) {
+    fprintf(stderr, "usage: %s ROA [ROA...]\n", argv[0]);
+    return 1;
+  }
   while (--argc > 0)
     result |=  read_roa(*++argv, 0, 1, 1) == NULL;
   return result;