diff --git a/ext/json/json.gemspec b/ext/json/json.gemspec
index 07426363ac..5575731025 100644
--- a/ext/json/json.gemspec
+++ b/ext/json/json.gemspec
@@ -44,8 +44,7 @@ spec = Gem::Specification.new do |s|
     "LEGAL",
     "README.md",
     "json.gemspec",
-    *Dir["lib/**/*.rb"],
-  ]
+  ] + Dir.glob("lib/**/*.rb", base: File.expand_path("..", __FILE__))
 
   if java_ext
     s.platform = 'java'
diff --git a/ext/openssl/openssl.gemspec b/ext/openssl/openssl.gemspec
index 9f7c718592..2ec1551885 100644
--- a/ext/openssl/openssl.gemspec
+++ b/ext/openssl/openssl.gemspec
@@ -13,7 +13,8 @@ Gem::Specification.new do |spec|
     spec.files       = []
     spec.add_runtime_dependency('jruby-openssl', '~> 0.14')
   else
-    spec.files         = Dir["lib/**/*.rb", "ext/**/*.{c,h,rb}", "*.md", "BSDL", "COPYING"]
+    spec.files         = Dir.glob(["lib/**/*.rb", "ext/**/*.{c,h,rb}", "*.md"], base: File.expand_path("..", __FILE__)) +
+                         ["BSDL", "COPYING"]
     spec.require_paths = ["lib"]
     spec.extensions    = ["ext/openssl/extconf.rb"]
   end