diff --git a/c-bindings/wrapper.cpp b/c-bindings/wrapper.cpp
index 157dc2775..962e21ab5 100644
--- a/c-bindings/wrapper.cpp
+++ b/c-bindings/wrapper.cpp
@@ -2,7 +2,7 @@
 #include "verifier.hpp"
 
 extern "C" {
-    bool validate_proof(uint8_t* seed, uint8_t k, uint8_t* challenge, uint8_t* proof, uint16_t proof_len, uint8_t* quality_buf) {
+    bool validate_proof(const uint8_t* seed, uint8_t k, const uint8_t* challenge, const uint8_t* proof, uint16_t proof_len, uint8_t* quality_buf) {
         Verifier v;
         auto quality = v.ValidateProof(seed, k, challenge, proof, proof_len);
         if (quality.GetSize() == 0) {
diff --git a/c-bindings/wrapper.h b/c-bindings/wrapper.h
index 4a6c01df3..45532b401 100644
--- a/c-bindings/wrapper.h
+++ b/c-bindings/wrapper.h
@@ -1,5 +1,5 @@
 #include "picosha2.hpp"
 
 extern "C" {
-    bool validate_proof(uint8_t* seed, uint8_t k, uint8_t* challenge, uint8_t* proof, uint16_t proof_len, uint8_t* quality_buf);
+    bool validate_proof(const uint8_t* seed, uint8_t k, const uint8_t* challenge, const uint8_t* proof, uint16_t proof_len, uint8_t* quality_buf);
 }
diff --git a/rust-bindings/src/lib.rs b/rust-bindings/src/lib.rs
index 291f4d441..5e786ac28 100644
--- a/rust-bindings/src/lib.rs
+++ b/rust-bindings/src/lib.rs
@@ -22,10 +22,10 @@ pub fn validate_proof(
 
     unsafe {
         bindings::validate_proof(
-            seed.as_ptr() as *mut u8,
+            seed.as_ptr(),
             k,
-            challenge.as_ptr() as *mut u8,
-            proof.as_ptr() as *mut u8,
+            challenge.as_ptr(),
+            proof.as_ptr(),
             proof_len,
             quality.as_mut_ptr(),
         )