diff --git a/src/question_3.cpp b/src/question_3.cpp
index 566a14baac1c37d50efecc893b4593050656fd9a..67e524fe2d5557f313cf177e630732f816f62cb9 100644
--- a/src/question_3.cpp
+++ b/src/question_3.cpp
@@ -29,7 +29,7 @@ time_t algo_sqrt(mpz_class const& a, mpz_class & res)
 };
 
 int main(int argc, char** argv) {
-  assert(argc == 1);
+  assert(argc == 2);
   long n = strtol(argv[1], NULL, 10);
 
   mpz_class a(n);