diff --git a/libguac/src/protocol.c b/libguac/src/protocol.c
index 1e36e1cc..c0bac8da 100644
--- a/libguac/src/protocol.c
+++ b/libguac/src/protocol.c
@@ -330,11 +330,13 @@ int guac_send_png(GUACIO* io, int layer, int x, int y, png_byte** png_rows, int
         return -1;
     }
 
+#ifdef GUAC_FAST_PNG
     /* Do not filter (speed) */
     png_set_filter(png, PNG_FILTER_TYPE_BASE, PNG_FILTER_VALUE_NONE);
 
     /* Fast compression level */
     png_set_compression_level(png, 1);
+#endif
 
     /* Set error handler */
     if (setjmp(png_jmpbuf(png))) {