diff --git a/src/media/oiio.h b/src/media/oiio.h
index 5ff31419e..ece61c713 100644
--- a/src/media/oiio.h
+++ b/src/media/oiio.h
@@ -16,7 +16,7 @@ int oiio_blit(ncvisual* ncv, int rows, int cols,
               const blitterargs* bargs);
 ncvisual* oiio_from_file(const char* filename);
 int oiio_decode_loop(ncvisual* ncv);
-int oiio_resize(ncvisual* nc, int rows, int cols);
+int oiio_resize(ncvisual* nc, unsigned rows, unsigned cols);
 ncvisual* oiio_create(void);
 void oiio_destroy(ncvisual* ncv);
 int oiio_blit_dispatch(struct ncplane* nc, const struct blitset* bset,