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-rw-r--r--test/mandelbrot.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/mandelbrot.h b/test/mandelbrot.h
index 183ce7e11..4e7b58ccf 100644
--- a/test/mandelbrot.h
+++ b/test/mandelbrot.h
@@ -28,7 +28,7 @@
#include <FL/Fl.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Slider.H>
-#include <FL/Fl_Window.H>
+#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Input.H>
class Drawing_Area : public Fl_Box {