diff --git a/src/core/gpu.cpp b/src/core/gpu.cpp
index 0eb47979b..2fd797456 100644
--- a/src/core/gpu.cpp
+++ b/src/core/gpu.cpp
@@ -909,7 +909,7 @@ void GPU::CRTCTickEvent(TickCount ticks)
       if (m_GPUSTAT.vertical_interlace)
       {
         m_crtc_state.interlaced_field ^= 1u;
-        m_GPUSTAT.interlaced_field = m_crtc_state.interlaced_field;
+        m_GPUSTAT.interlaced_field = !m_crtc_state.interlaced_field;
       }
       else
       {