diff --git a/src/lib/internal.h b/src/lib/internal.h
index a25c2075d..6901b801d 100644
--- a/src/lib/internal.h
+++ b/src/lib/internal.h
@@ -1737,7 +1737,7 @@ create_polyfill_op(int y, int x, struct topolyfill** stck){
 typedef struct ncvisual_implementation {
   int (*visual_init)(int loglevel);
   void (*visual_printbanner)(fbuf* f);
-  int (*visual_blit)(struct ncvisual* ncv, int rows, int cols, ncplane* n,
+  int (*visual_blit)(struct ncvisual* ncv, unsigned rows, unsigned cols, ncplane* n,
                      const struct blitset* bset, const blitterargs* barg);
   struct ncvisual* (*visual_create)(void);
   struct ncvisual* (*visual_from_file)(const char* fname);
diff --git a/src/media/ffmpeg.c b/src/media/ffmpeg.c
index 43d76063a..33026adc1 100644
--- a/src/media/ffmpeg.c
+++ b/src/media/ffmpeg.c
@@ -631,7 +631,7 @@ int ffmpeg_resize(ncvisual* n, unsigned rows, unsigned cols){
 }
 
 // rows/cols: scaled output geometry (pixels)
-int ffmpeg_blit(ncvisual* ncv, int rows, int cols, ncplane* n,
+int ffmpeg_blit(ncvisual* ncv, unsigned rows, unsigned cols, ncplane* n,
                 const struct blitset* bset, const blitterargs* bargs){
   void* data;
   int stride = 0;
diff --git a/src/media/oiio.cpp b/src/media/oiio.cpp
index e2070aeed..4e3afab22 100644
--- a/src/media/oiio.cpp
+++ b/src/media/oiio.cpp
@@ -144,7 +144,7 @@ int oiio_resize(ncvisual* nc, unsigned rows, unsigned cols) {
   return 0;
 }
 
-int oiio_blit(struct ncvisual* ncv, int rows, int cols,
+int oiio_blit(struct ncvisual* ncv, unsigned rows, unsigned cols,
               ncplane* n, const struct blitset* bset,
               const blitterargs* bargs) {
 //fprintf(stderr, "%d/%d -> %d/%d on the resize\n", ncv->pixy, ncv->pixx, rows, cols);
diff --git a/src/media/oiio.h b/src/media/oiio.h
index ece61c713..18d1139fd 100644
--- a/src/media/oiio.h
+++ b/src/media/oiio.h
@@ -11,7 +11,7 @@ int oiio_decode(ncvisual* nc);
 struct ncvisual_details* oiio_details_init(void);
 void oiio_printbanner(fbuf* f);
 void oiio_details_seed(struct ncvisual* ncv);
-int oiio_blit(ncvisual* ncv, int rows, int cols,
+int oiio_blit(ncvisual* ncv, unsigned rows, unsigned cols,
               struct ncplane* n, const struct blitset* bset,
               const blitterargs* bargs);
 ncvisual* oiio_from_file(const char* filename);