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-rw-r--r--lib/rdoc/generator/json_index.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/rdoc/generator/json_index.rb b/lib/rdoc/generator/json_index.rb
index 931438b3c3..ea9384e6d3 100644
--- a/lib/rdoc/generator/json_index.rb
+++ b/lib/rdoc/generator/json_index.rb
@@ -170,7 +170,7 @@ class RDoc::Generator::JsonIndex
outfile = out_dir + "#{search_index_file}.gz"
debug_msg "Reading the JSON index file from %s" % search_index_file
- search_index = search_index_file.read
+ search_index = search_index_file.read(mode: 'r:utf-8')
debug_msg "Writing gzipped search index to %s" % outfile