diff --git a/src/libSchnorr/src/Schnorr_PubKey.cpp b/src/libSchnorr/src/Schnorr_PubKey.cpp
index 01c3b52..6e39ea1 100644
--- a/src/libSchnorr/src/Schnorr_PubKey.cpp
+++ b/src/libSchnorr/src/Schnorr_PubKey.cpp
@@ -113,7 +113,7 @@ bool PubKey::Serialize(bytes& dst, unsigned int offset) const {
 
 bool PubKey::Deserialize(const bytes& src, unsigned int offset) {
   shared_ptr<EC_POINT> result =
-      ECPOINTSerialize::GetNumber(src, offset, PUB_KEY_SIZE);
+      ECPOINTSerialize::GetNumber(src, offset, src.size());
 
   if (result == nullptr) {
     // ECPOINTSerialize::GetNumber failed