diff --git a/src/script/sign.cpp b/src/script/sign.cpp
index 47114d2e2a..67d102cc0e 100644
--- a/src/script/sign.cpp
+++ b/src/script/sign.cpp
@@ -48,7 +48,7 @@ static bool GetCScript(const SigningProvider& provider, const SignatureData& sig
     return false;
 }
 
-static bool GetPubKey(const SigningProvider& provider, SignatureData& sigdata, const CKeyID& address, CPubKey& pubkey)
+static bool GetPubKey(const SigningProvider& provider, const SignatureData& sigdata, const CKeyID& address, CPubKey& pubkey)
 {
     // Look for pubkey in all partial sigs
     const auto it = sigdata.signatures.find(address);