diff --git a/src/core/gpu.cpp b/src/core/gpu.cpp
index f1e85083b..ed086e83e 100644
--- a/src/core/gpu.cpp
+++ b/src/core/gpu.cpp
@@ -899,7 +899,7 @@ void GPU::CRTCTickEvent(TickCount ticks)
     m_crtc_state.active_line_lsb =
       Truncate8((m_crtc_state.regs.Y + BoolToUInt32(m_crtc_state.interlaced_display_field)) & u32(1));
     m_GPUSTAT.display_line_lsb = ConvertToBoolUnchecked(
-      (m_crtc_state.regs.Y + (BoolToUInt8(m_crtc_state.in_vblank) ^ m_crtc_state.interlaced_display_field)) & u32(1));
+      (m_crtc_state.regs.Y + (BoolToUInt8(!m_crtc_state.in_vblank) & m_crtc_state.interlaced_display_field)) & u32(1));
   }
   else
   {