diff --git a/src/plugins/screencast/screencaststream.cpp b/src/plugins/screencast/screencaststream.cpp
index 30c65afd9d..023a2fe5b8 100644
--- a/src/plugins/screencast/screencaststream.cpp
+++ b/src/plugins/screencast/screencaststream.cpp
@@ -582,12 +582,7 @@ void ScreenCastStream::addHeader(spa_buffer *spaBuffer)
         spaHeader->flags = 0;
         spaHeader->dts_offset = 0;
         spaHeader->seq = m_sequential++;
-
-        const auto timestamp = m_source->clock();
-        if (!m_start) {
-            m_start = timestamp;
-        }
-        spaHeader->pts = (timestamp - m_start.value()).count();
+        spaHeader->pts = m_source->clock().count();
     }
 }
 
diff --git a/src/plugins/screencast/screencaststream.h b/src/plugins/screencast/screencaststream.h
index 4e892cc8cb..c751c04d00 100644
--- a/src/plugins/screencast/screencaststream.h
+++ b/src/plugins/screencast/screencaststream.h
@@ -128,7 +128,6 @@ private:
     pw_buffer *m_pendingBuffer = nullptr;
     std::unique_ptr<QSocketNotifier> m_pendingNotifier;
     std::unique_ptr<EGLNativeFence> m_pendingFence;
-    std::optional<std::chrono::nanoseconds> m_start;
     quint64 m_sequential = 0;
     bool m_hasDmaBuf = false;
     bool m_waitForNewBuffers = false;