diff --git a/src/kzg_proofs.c b/src/kzg_proofs.c
index c3b185d..58ed142 100644
--- a/src/kzg_proofs.c
+++ b/src/kzg_proofs.c
@@ -79,8 +79,8 @@ C_KZG_RET compute_proof_multi(blst_p1 *out, const KZGSettings *ks, poly *p, cons
 
     commit_to_poly(out, ks, &q);
 
-    free_poly(q);
-    free_poly(divisor);
+    free_poly(&q);
+    free_poly(&divisor);
 
     return C_KZG_OK;
 }
diff --git a/src/kzg_proofs_test.c b/src/kzg_proofs_test.c
index bbaf210..21d00a5 100644
--- a/src/kzg_proofs_test.c
+++ b/src/kzg_proofs_test.c
@@ -75,7 +75,7 @@ void proof_single(void) {
     TEST_CHECK(true == check_proof_single(&ks, &commitment, &proof, &x, &value));
 
     free_fft_settings(&fs);
-    free_poly(p);
+    free_poly(&p);
     free(s1);
     free(s2);
 }
@@ -128,7 +128,7 @@ void proof_multi(void) {
 
     free_fft_settings(&fs1);
     free_fft_settings(&fs2);
-    free_poly(p);
+    free_poly(&p);
     free(s1);
     free(s2);
 }
@@ -145,7 +145,7 @@ void proof_single_error(void) {
     fr_from_uint64(&x, 1234);
     TEST_CHECK(C_KZG_BADARGS == compute_proof_single(&proof, &ks, &p, &x));
 
-    free_poly(p);
+    free_poly(&p);
 }
 
 TEST_LIST =
diff --git a/src/poly.c b/src/poly.c
index 7bf71a7..bf68673 100644
--- a/src/poly.c
+++ b/src/poly.c
@@ -26,8 +26,8 @@ void init_poly(poly *out, const uint64_t length) {
     out->coeffs = malloc(length * sizeof(blst_fr));
 }
 
-void free_poly(poly p) {
-    free(p.coeffs);
+void free_poly(poly *p) {
+    free(p->coeffs);
 }
 
 void eval_poly(blst_fr *out, const poly *p, const blst_fr *x) {
diff --git a/src/poly.h b/src/poly.h
index 64dc960..8230dd9 100644
--- a/src/poly.h
+++ b/src/poly.h
@@ -24,7 +24,7 @@ typedef struct {
 } poly;
 
 void init_poly(poly *out, const uint64_t length);
-void free_poly(poly p);
+void free_poly(poly *p);
 void eval_poly(blst_fr *out, const poly *p, const blst_fr *x);
 C_KZG_RET poly_quotient_length(uint64_t *out, const poly *dividend, const poly *divisor);
 C_KZG_RET poly_long_div(poly *out, const poly *dividend, const poly *divisor);