diff --git a/src/core/gpu_sw.cpp b/src/core/gpu_sw.cpp
index edf6c69c3..158e80b05 100644
--- a/src/core/gpu_sw.cpp
+++ b/src/core/gpu_sw.cpp
@@ -811,8 +811,8 @@ void GPU_SW::DispatchRenderCommand()
           cmd->vertices[i].x = m_drawing_offset.x + vp.x;
           cmd->vertices[i].y = m_drawing_offset.y + vp.y;
 
-          const auto [min_x, max_x] = MinMax(cmd->vertices[i - 1].x, cmd->vertices[i].y);
-          const auto [min_y, max_y] = MinMax(cmd->vertices[i - 1].x, cmd->vertices[i].y);
+          const auto [min_x, max_x] = MinMax(cmd->vertices[i - 1].x, cmd->vertices[i].x);
+          const auto [min_y, max_y] = MinMax(cmd->vertices[i - 1].y, cmd->vertices[i].y);
           if ((max_x - min_x) >= MAX_PRIMITIVE_WIDTH || (max_y - min_y) >= MAX_PRIMITIVE_HEIGHT)
           {
             Log_DebugPrintf("Culling too-large line: %d,%d - %d,%d", cmd->vertices[i - 1].x, cmd->vertices[i - 1].y,