This is due to the rev task defined in Gruntfile.js . Do not think this is a simple solution for this at the moment, so I just comment out the line for renaming the images:
// Gruntfile.js // ... rev: { dist: { files: { src: [ '<%= yeoman.dist %>/scripts/{,*/}*.js', '<%= yeoman.dist %>/styles/{,*/}*.css', // '<%= yeoman.dist %>/images/{,*/}*.{png,jpg,jpeg,gif,webp}', '<%= yeoman.dist %>/styles/fonts/*' ] } } }
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