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-rw-r--r--backends/sdl/sdl_gl.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/backends/sdl/sdl_gl.cpp b/backends/sdl/sdl_gl.cpp
index e831d1d338..ead5e92e8e 100644
--- a/backends/sdl/sdl_gl.cpp
+++ b/backends/sdl/sdl_gl.cpp
@@ -294,6 +294,8 @@ void OSystem_SDL_OpenGL::hotswap_gfx_mode() {
if (!_screen)
return;
+ StackLock lock(_mutex); // Lock the mutex until this function ends
+
// Keep around the old _screen & _tmpscreen so we can restore the screen data
// after the mode switch.
SDL_Surface *old_screen = _screen;