diff --git a/src/lib/platform/PortalInputCapture.cpp b/src/lib/platform/PortalInputCapture.cpp
index 82e23af3a..b5de16d40 100644
--- a/src/lib/platform/PortalInputCapture.cpp
+++ b/src/lib/platform/PortalInputCapture.cpp
@@ -247,7 +247,7 @@ void PortalInputCapture::handleSessionClosed(XdpSession *session)
   m_signals.at(Signal::SessionClosed) = 0;
 }
 
-void PortalInputCapture::claimClipboardOwnership([[maybe_unused]] XdpSession *session)
+void PortalInputCapture::claimClipboardOwnership([[maybe_unused]] XdpSession *session) const
 {
 #ifdef HAVE_LIBPORTAL_CLIPBOARD
   PortalClipboard::claimOwnership(m_clipboard, session);
diff --git a/src/lib/platform/PortalInputCapture.h b/src/lib/platform/PortalInputCapture.h
index d3fbdd8f2..001f73555 100644
--- a/src/lib/platform/PortalInputCapture.h
+++ b/src/lib/platform/PortalInputCapture.h
@@ -60,7 +60,7 @@ private:
 
   void handleSelectionTransfer(XdpSession *session, const char *mimeType, uint32_t serial);
   void readClipboardSelection(XdpSession *session) const;
-  void claimClipboardOwnership(XdpSession *session);
+  void claimClipboardOwnership(XdpSession *session) const;
 
   /// g_signal_connect callback wrapper
   static void sessionClosed(XdpSession *session, const gpointer data)