diff --git a/tomo.gemspec b/tomo.gemspec
index c7eca02d..10ddde7d 100644
--- a/tomo.gemspec
+++ b/tomo.gemspec
@@ -31,4 +31,6 @@ Gem::Specification.new do |spec|
   spec.bindir = "exe"
   spec.executables = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
+
+  spec.add_dependency "abbrev"
 end