diff --git a/libavutil/spherical.c b/libavutil/spherical.c
index 0ca2dd367a..f0b622128a 100644
--- a/libavutil/spherical.c
+++ b/libavutil/spherical.c
@@ -33,7 +33,7 @@ AVSphericalMapping *av_spherical_alloc(size_t *size)
     return spherical;
 }
 
-void av_spherical_tile_bounds(AVSphericalMapping *map,
+void av_spherical_tile_bounds(const AVSphericalMapping *map,
                               size_t width, size_t height,
                               size_t *left, size_t *top,
                               size_t *right, size_t *bottom)
diff --git a/libavutil/spherical.h b/libavutil/spherical.h
index db9bdc0be5..f4e0d60966 100644
--- a/libavutil/spherical.h
+++ b/libavutil/spherical.h
@@ -202,7 +202,7 @@ AVSphericalMapping *av_spherical_alloc(size_t *size);
  * @param right  Pixels from the right edge.
  * @param bottom Pixels from the bottom edge.
  */
-void av_spherical_tile_bounds(AVSphericalMapping *map,
+void av_spherical_tile_bounds(const AVSphericalMapping *map,
                               size_t width, size_t height,
                               size_t *left, size_t *top,
                               size_t *right, size_t *bottom);