diff --git a/lib/licensee/project_files/license_file.rb b/lib/licensee/project_files/license_file.rb
index c637e7c..888a3e1 100644
--- a/lib/licensee/project_files/license_file.rb
+++ b/lib/licensee/project_files/license_file.rb
@@ -8,7 +8,7 @@ module Licensee
       PREFERRED_EXT_REGEX = /\.#{Regexp.union(PREFERRED_EXT)}\z/
 
       # Regex to match any extension except .spdx or .header
-      OTHER_EXT_REGEX = %r{\.(?!spdx|header)[^./]+\z}i
+      OTHER_EXT_REGEX = %r{\.(?!spdx|header|gemspec)[^./]+\z}i
 
       # Regex to match, LICENSE, LICENCE, unlicense, etc.
       LICENSE_REGEX = /(un)?licen[sc]e/i