diff --git a/src/xwl/xwaylandsocket.cpp b/src/xwl/xwaylandsocket.cpp
index c588b67e3f..96c64d7c59 100644
--- a/src/xwl/xwaylandsocket.cpp
+++ b/src/xwl/xwaylandsocket.cpp
@@ -41,7 +41,7 @@ UnixSocketAddress::UnixSocketAddress(const QString &socketPath, Type type)
 {
     const QByteArray encodedSocketPath = QFile::encodeName(socketPath);
 
-    int byteCount = offsetof(sockaddr_un, sun_path) + encodedSocketPath.size();
+    int byteCount = offsetof(sockaddr_un, sun_path) + encodedSocketPath.size() + 1;
     if (type == Type::Abstract) {
         byteCount++; // For the first '\0'.
     }