diff --git a/include/xrpl/protocol/MPTIssue.h b/include/xrpl/protocol/MPTIssue.h
index 7f473da6a2..49c1fd63dc 100644
--- a/include/xrpl/protocol/MPTIssue.h
+++ b/include/xrpl/protocol/MPTIssue.h
@@ -151,7 +151,7 @@ namespace std {
 template <>
 struct hash<xrpl::MPTID> : xrpl::MPTID::hasher
 {
-    explicit hash() = default;
+    hash() = default;
 };
 
 }  // namespace std