diff --git a/ex-1/landau.c b/ex-1/landau.c
index 5728721..6a4a982 100644
--- a/ex-1/landau.c
+++ b/ex-1/landau.c
@@ -92,6 +92,10 @@ double landau_qdf(double p0) {
   }
 
   fprintf(stderr, "QDF error: %.3g\n", upp - low);
+  double root = gsl_root_fsolver_root(s);
 
-  return gsl_root_fsolver_root(s);
+  // free memory
+  gsl_root_fsolver_free(s);
+
+  return root;
 }