fix issue 151

[GiggleLiu]

try to fix the issue #151, but failled.

[codecov-commenter]

Codecov Report

Merging #152 (e87b0a3) into master (556df4f) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #152   +/-   ##
=======================================
  Coverage   89.02%   89.02%           
=======================================
  Files          12       12           
  Lines         975      975           
=======================================
  Hits          868      868           
  Misses        107      107           

Impacted Files	Coverage Δ
src/interfaces.jl	100.00% <100.00%> (ø)

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