diff --git a/src/net/AllocatedSocketAddress.hxx b/src/net/AllocatedSocketAddress.hxx
index def181a8c..30ed8d819 100644
--- a/src/net/AllocatedSocketAddress.hxx
+++ b/src/net/AllocatedSocketAddress.hxx
@@ -89,7 +89,7 @@ public:
 		return (SocketAddress)*this == other;
 	}
 
-	bool operator!=(SocketAddress &other) const noexcept {
+	bool operator!=(SocketAddress other) const noexcept {
 		return !(*this == other);
 	}