Index: willuslib/wmupdf.c
--- willuslib/wmupdf.c.orig
+++ willuslib/wmupdf.c
@@ -1051,7 +1051,7 @@ printf("    srcptr = %p\n",srcbuf->data);
 
         whitespace[0]=' ';
         whitespace[1]='\0';
-        fz_write_buffer(ctx,dstbuf,whitespace,1);
+        fz_append_data(ctx,dstbuf,whitespace,1);
         }
     /* mupdf 1.10a--replace write with append */
     /*
@@ -1153,7 +1153,7 @@ static int new_stream_object(pdf_document *xref,fz_con
     pdf_update_object(ctx,xref,ref,obj);
     pdf_drop_obj(ctx,obj);
     fzbuf=fz_new_buffer(ctx,strlen(buf));
-    fz_write_buffer(ctx,fzbuf,(unsigned char *)buf,strlen(buf));
+    fz_append_data(ctx,fzbuf,(unsigned char *)buf,strlen(buf));
     wmupdf_update_stream(ctx,xref,ref,fzbuf);
     fz_drop_buffer(ctx,fzbuf);
     return(ref);
