diff --git a/src/test/sigencoding_tests.cpp b/src/test/sigencoding_tests.cpp
--- a/src/test/sigencoding_tests.cpp
+++ b/src/test/sigencoding_tests.cpp
@@ -37,7 +37,7 @@
         baseSigHashes.push_back(baseSigHash.withAnyoneCanPay(true));
     }
 
-    for (const SigHashType baseSigHash : baseSigHashes) {
+    for (const SigHashType &baseSigHash : baseSigHashes) {
         // Check the signature with the proper forkid flag.
         SigHashType sigHash = baseSigHash.withForkId(hasForkId);
         valtype validSig = SignatureWithHashType(vchSig, sigHash);