diff --git a/src/polyxx/polynomial.cpp b/src/polyxx/polynomial.cpp
index 0615b6e..a71c51f 100644
--- a/src/polyxx/polynomial.cpp
+++ b/src/polyxx/polynomial.cpp
@@ -386,6 +386,7 @@ namespace poly {
     for (std::size_t i = 0; i < size; ++i) {
       res.emplace_back(tmp[i]);
     }
+    tmp.clear();
     return res;
   }
 
@@ -400,6 +401,7 @@ namespace poly {
     for (std::size_t i = 0; i < size; ++i) {
       res.emplace_back(tmp[i]);
     }
+    tmp.clear();
     return res;
   }
 
diff --git a/src/polyxx/upolynomial.cpp b/src/polyxx/upolynomial.cpp
index 90c21c1..9e18c1f 100644
--- a/src/polyxx/upolynomial.cpp
+++ b/src/polyxx/upolynomial.cpp
@@ -100,16 +100,19 @@ namespace poly {
   }
 
   std::vector<Integer> coefficients(const UPolynomial& p) {
-    lp_integer_t coeffs[degree(p) + 1];
+    std::vector<lp_integer_t> coeffs;
+    lp_integer_t *tmp = nullptr;
     for (std::size_t i = 0; i < degree(p) + 1; ++i) {
-      lp_integer_construct_from_int(lp_Z, &coeffs[i], 0);
+      lp_integer_construct_from_int(lp_Z, tmp, 0);
+      coeffs.push_back(*tmp);
     }
-    lp_upolynomial_unpack(p.get_internal(), coeffs);
+    lp_upolynomial_unpack(p.get_internal(), coeffs.data());
     std::vector<Integer> res;
     for (std::size_t i = 0; i < degree(p) + 1; ++i) {
       res.emplace_back(&coeffs[i]);
       lp_integer_destruct(&coeffs[i]);
     }
+    coeffs.clear();
     return res;
   }