diff --git a/Library/Homebrew/test/os/mac/pkgconfig_spec.rb b/Library/Homebrew/test/os/mac/pkgconfig_spec.rb
index 4b0e2abbba..4966820767 100644
--- a/Library/Homebrew/test/os/mac/pkgconfig_spec.rb
+++ b/Library/Homebrew/test/os/mac/pkgconfig_spec.rb
@@ -39,7 +39,7 @@ describe "pkg-config" do
                   .grep(/^#define XML_(MAJOR|MINOR|MICRO)_VERSION (\d+)$/) do
                     { Regexp.last_match(1).downcase => Regexp.last_match(2) }
                   end
-                  .inject(:merge!)
+                  .reduce(:merge!)
     version = "#{version["major"]}.#{version["minor"]}.#{version["micro"]}"
 
     expect(pc_version("expat")).to eq(version)
@@ -100,7 +100,7 @@ describe "pkg-config" do
                   .grep(/^#define NCURSES_VERSION_(MAJOR|MINOR|PATCH) (\d+)$/) do
                     { Regexp.last_match(1).downcase => Regexp.last_match(2) }
                   end
-                  .inject(:merge!)
+                  .reduce(:merge!)
     version = "#{version["major"]}.#{version["minor"]}.#{version["patch"]}"
 
     expect(pc_version("ncurses")).to eq(version)