1 files changed, 5 insertions, 5 deletions
diff --git a/libdimension/png-stubs.c b/libdimension/png-stubs.c
index 04fe608..2696955 100644
--- a/libdimension/png-stubs.c
+++ b/libdimension/png-stubs.c
@@ -29,34 +29,34 @@
 int
 dmnsn_png_optimize_canvas(dmnsn_canvas *canvas)
 {
-  errno = ENOTSUP;
+  errno = ENOSYS;
   return -1;
 }
 
 int
 dmnsn_png_write_canvas(const dmnsn_canvas *canvas, FILE *file)
 {
-  errno = ENOTSUP;
+  errno = ENOSYS;
   return -1;
 }
 
 dmnsn_progress *
 dmnsn_png_write_canvas_async(const dmnsn_canvas *canvas, FILE *file)
 {
-  errno = ENOTSUP;
+  errno = ENOSYS;
   return NULL;
 }
 
 dmnsn_canvas *
 dmnsn_png_read_canvas(FILE *file)
 {
-  errno = ENOTSUP;
+  errno = ENOSYS;
   return NULL;
 }
 
 dmnsn_progress *
 dmnsn_png_read_canvas_async(dmnsn_canvas **canvas, FILE *file)
 {
-  errno = ENOTSUP;
+  errno = ENOSYS;
   return NULL;
 }