diff --git a/exp-drd/tests/omp_matinv.c b/exp-drd/tests/omp_matinv.c
index e2580780f..8bd333728 100644
--- a/exp-drd/tests/omp_matinv.c
+++ b/exp-drd/tests/omp_matinv.c
@@ -299,6 +299,7 @@ int main(int argc, char** argv)
   if (optind + 1 != argc)
   {
     fprintf(stderr, "Error: wrong number of arguments.\n");
+    return 1;
   }
   matrix_size = atoi(argv[optind]);
 
diff --git a/exp-drd/tests/omp_prime.c b/exp-drd/tests/omp_prime.c
index ea11b6f39..bdd7982e0 100644
--- a/exp-drd/tests/omp_prime.c
+++ b/exp-drd/tests/omp_prime.c
@@ -57,6 +57,7 @@ int main(int argc, char **argv)
   if (optind + 1 != argc)
   {
     fprintf(stderr, "Error: wrong number of arguments.\n");
+    return 1;
   }
   n = atoi(argv[optind]);