diff --git a/savebj.m b/savebj.m
index 5052323..ebb2e1f 100644
--- a/savebj.m
+++ b/savebj.m
@@ -292,7 +292,7 @@
     else
         fid = fopen(filename, writemode, fileendian);
     end
-    fwrite(fid,json);
+    fwrite(fid,uint8(json));
     fclose(fid);
 end
 
@@ -1060,4 +1060,4 @@
     newdata=swapbytes(data);
 else
     newdata=data;
-end
\ No newline at end of file
+end