diff --git a/hash/cpu/bench/Poseidon2/Zikkurat/poseidon2.c b/hash/cpu/bench/Poseidon2/Zikkurat/poseidon2.c
index 75cd78e..0d11652 100644
--- a/hash/cpu/bench/Poseidon2/Zikkurat/poseidon2.c
+++ b/hash/cpu/bench/Poseidon2/Zikkurat/poseidon2.c
@@ -396,13 +396,6 @@ int main( int argc, char *argv[] ) {
 
   switch(argc) {
 
-    case 1:
-      printf("usage:\n");
-      printf("$ poseidon2 <merkle_depth>:\n");
-      printf("$ poseidon2 <merkle_depth> <nthreads>:\n");
-      exit(-1);
-      break;
-
     case 2:
       mtDepth  = atoi(argv[1]);
       break;
@@ -411,6 +404,13 @@ int main( int argc, char *argv[] ) {
       mtDepth  = atoi(argv[1]);
       nThreads = atoi(argv[2]);
       break;
+
+    default:
+      printf("usage:\n");
+      printf("$ poseidon2 <merkle_depth>:\n");
+      printf("$ poseidon2 <merkle_depth> <nthreads>:\n");
+      exit(-1);
+      break;
   }
 
   printf("calculating Poseidon2 Merkle root with depth=%d on %d threads...\n",mtDepth,nThreads);