diff --git a/glslview.c b/glslview.c
index fd0b180..1bb84e2 100644
--- a/glslview.c
+++ b/glslview.c
@@ -207,7 +207,7 @@ static void savePNG(int width, int height, const char *output_dir) {
 
 	uint8_t *row_pointers[height];
 	for (size_t i = 0; i < height; i++)
-		row_pointers[i] = &pixels[4*i*width];
+		row_pointers[i] = &pixels[4*(height-1-i)*width];
 
 	png_set_rows(png_ptr, info_ptr, row_pointers);
 	png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);