diff --git a/fbgrab.c b/fbgrab.c
index 2abc08a..287cede 100644
--- a/fbgrab.c
+++ b/fbgrab.c
@@ -335,7 +335,7 @@ static void write_PNG(unsigned char *outbuffer, char *filename,
 
     png_init_io(png_ptr, outfile);
 
-    png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
+    png_set_compression_level(png_ptr, compression);
 
     bit_depth = 8;
     color_type = PNG_COLOR_TYPE_RGB_ALPHA;