diff --git a/src/graphics/graphics.c b/src/graphics/graphics.c
index c2c0f9f..8e13482 100644
--- a/src/graphics/graphics.c
+++ b/src/graphics/graphics.c
@@ -833,7 +833,7 @@ void main_test_graphics (void)
                 for (int w = 0; w < min_z; w++)
                     if (u + v + w < mxyz) {
     arrows_nb = set_arrow (arrows_ptr, arrows_nb, 1, 1, 1, 0, i, u, v, w, 0);
-    arrows_nb = set_arrow (arrows_ptr, arrows_nb, space_X, space_Y, space_Z, 0, i, space_X - u, space_Y - v, space_Z - w, 0);
+    arrows_nb = set_arrow (arrows_ptr, arrows_nb, space_X, space_Y, space_Z, 0, i, space_X - u - 1, space_Y - v - 1, space_Z - w - 1, 0);
     }
 
     printf("\n+ effacement des flèches dans l'angle-origine\