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-rw-r--r--lib/prism/prism.gemspec1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/prism/prism.gemspec b/lib/prism/prism.gemspec
index 63c6702561..faabc22de9 100644
--- a/lib/prism/prism.gemspec
+++ b/lib/prism/prism.gemspec
@@ -47,6 +47,7 @@ Gem::Specification.new do |spec|
"include/prism/node.h",
"include/prism/pack.h",
"include/prism/parser.h",
+ "include/prism/prettyprint.h",
"include/prism/regexp.h",
"include/prism/util/pm_buffer.h",
"include/prism/util/pm_char.h",