diff --git a/kpty/kpty.h b/kpty/kpty.h
index bd7228a2..b5c5c32b 100644
--- a/kpty/kpty.h
+++ b/kpty/kpty.h
@@ -23,7 +23,7 @@
 
 #include "kpty_export.h"
 
-struct KPtyPrivate;
+class KPtyPrivate;
 struct termios;
 
 /**
diff --git a/kpty/kpty_p.h b/kpty/kpty_p.h
index 06877f8e..104ecf08 100644
--- a/kpty/kpty_p.h
+++ b/kpty/kpty_p.h
@@ -27,9 +27,10 @@
 
 #include <QtCore/QByteArray>
 
-struct KPtyPrivate {
+class KPtyPrivate {
     Q_DECLARE_PUBLIC(KPty)
 
+public:
     KPtyPrivate(KPty* parent);
     virtual ~KPtyPrivate();
 #ifndef HAVE_OPENPTY
diff --git a/kpty/kptydevice.cpp b/kpty/kptydevice.cpp
index cf208a49..86d34d93 100644
--- a/kpty/kptydevice.cpp
+++ b/kpty/kptydevice.cpp
@@ -245,9 +245,10 @@ static void qt_ignore_sigpipe()
 
 #define NO_INTR(ret,func) do { ret = func; } while (ret < 0 && errno == EINTR)
 
-struct KPtyDevicePrivate : public KPtyPrivate {
+class KPtyDevicePrivate : public KPtyPrivate {
     Q_DECLARE_PUBLIC(KPtyDevice)
 
+public:
     KPtyDevicePrivate(KPty* parent) :
         KPtyPrivate(parent),
         emittedReadyRead(false), emittedBytesWritten(false),
diff --git a/kpty/kptydevice.h b/kpty/kptydevice.h
index 64662ba1..5e4bd50f 100644
--- a/kpty/kptydevice.h
+++ b/kpty/kptydevice.h
@@ -25,7 +25,7 @@
 
 #include <QtCore/QIODevice>
 
-struct KPtyDevicePrivate;
+class KPtyDevicePrivate;
 
 #define Q_DECLARE_PRIVATE_MI(Class, SuperClass) \
     inline Class##Private* d_func() { return reinterpret_cast<Class##Private *>(SuperClass::d_ptr); } \