diff --git a/internal_client.cpp b/internal_client.cpp
index 97830d7ac4..30f7303fea 100644
--- a/internal_client.cpp
+++ b/internal_client.cpp
@@ -144,6 +144,16 @@ QSize InternalClient::clientSize() const
     return m_clientSize;
 }
 
+QSize InternalClient::minSize() const
+{
+    return m_internalWindow->minimumSize();
+}
+
+QSize InternalClient::maxSize() const
+{
+    return m_internalWindow->maximumSize();
+}
+
 void InternalClient::debug(QDebug &stream) const
 {
     stream.nospace() << "\'InternalClient:" << m_internalWindow << "\'";
diff --git a/internal_client.h b/internal_client.h
index 5766af714d..cd1e8f6d27 100644
--- a/internal_client.h
+++ b/internal_client.h
@@ -43,6 +43,8 @@ public:
     QString captionSuffix() const override;
     QPoint clientContentPos() const override;
     QSize clientSize() const override;
+    QSize minSize() const override;
+    QSize maxSize() const override;
     void debug(QDebug &stream) const override;
     QRect transparentRect() const override;
     NET::WindowType windowType(bool direct = false, int supported_types = 0) const override;