diff --git a/pngwutil.c b/pngwutil.c
--- a/pngwutil.c
+++ b/pngwutil.c
@@ -353,8 +353,10 @@ png_deflate_claim(png_structrp png_ptr, 
          if ((png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY) != 0)
             strategy = png_ptr->zlib_strategy;
 
+#ifdef PNG_WRITE_FILTER_SUPPORTED
          else if (png_ptr->do_filter != PNG_FILTER_NONE)
             strategy = PNG_Z_DEFAULT_STRATEGY;
+#endif
 
          else
             strategy = PNG_Z_DEFAULT_NOFILTER_STRATEGY;
@@ -840,12 +842,16 @@ png_write_IHDR(png_structrp png_ptr, png
 
    if ((png_ptr->do_filter) == PNG_NO_FILTERS)
    {
+#ifdef PNG_WRITE_FILTER_SUPPORTED
       if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE ||
           png_ptr->bit_depth < 8)
          png_ptr->do_filter = PNG_FILTER_NONE;
 
       else
          png_ptr->do_filter = PNG_ALL_FILTERS;
+#else
+      png_ptr->do_filter = PNG_FILTER_NONE;
+#endif
    }
 
    png_ptr->mode = PNG_HAVE_IHDR; /* not READY_FOR_ZTXT */