diff --git a/src/harness/CMakeLists.txt b/src/harness/CMakeLists.txt
index 8e2a3fd22..595f75b05 100644
--- a/src/harness/CMakeLists.txt
+++ b/src/harness/CMakeLists.txt
@@ -16,6 +16,10 @@ target_include_directories(harness
         include
 )
 
+if(DETHRACE_FIX_BUGS)
+    target_compile_definitions(harness PRIVATE DETHRACE_FIX_BUGS)
+endif()
+
 target_link_libraries(harness PRIVATE brender compile_with_werror)
 
 if(WIN32)
@@ -70,6 +74,8 @@ if (IO_PLATFORM STREQUAL "SDL_OpenGL")
         renderers/gl/stored_context.c
         renderers/gl/stored_context.h
     )
+    target_include_directories(harness PRIVATE "${dethrace_SOURCE_DIR}/src/DETHRACE/common")
+    target_include_directories(harness PRIVATE "${dethrace_SOURCE_DIR}/src/S3/include")
     target_link_libraries(harness PRIVATE SDL2::SDL2 glad)
 endif()
 
diff --git a/src/harness/io_platforms/sdl_gl.c b/src/harness/io_platforms/sdl_gl.c
index 8cb94f86f..eebefdc3e 100644
--- a/src/harness/io_platforms/sdl_gl.c
+++ b/src/harness/io_platforms/sdl_gl.c
@@ -10,6 +10,10 @@
 #include "harness/config.h"
 #include "harness/trace.h"
 
+#include "globvars.h"
+#include "grafdata.h"
+#include "pd/sys.h"
+
 #define ARRAY_LEN(array) (sizeof((array)) / sizeof((array)[0]))
 
 int scancode_map[123];
@@ -308,6 +312,15 @@ void Input_GetMousePosition(int* pX, int* pY) {
     *pY -= vp_y;
     *pX *= sdl_window_scale.x;
     *pY *= sdl_window_scale.y;
+
+#if defined(DETHRACE_FIX_BUGS)
+    // In hires mode (640x480), the menus are still rendered at (320x240),
+    // so prescale the cursor coordinates accordingly.
+    *pX *= gGraf_specs[gGraf_data_index].phys_width;
+    *pX /= gGraf_specs[gReal_graf_data_index].phys_width;
+    *pY *= gGraf_specs[gGraf_data_index].phys_height;
+    *pY /= gGraf_specs[gReal_graf_data_index].phys_height;
+#endif
 }
 
 void Input_GetMouseButtons(int* pButton1, int* pButton2) {