diff --git a/Library/Homebrew/os/mac.rb b/Library/Homebrew/os/mac.rb
index 3547567ba7..27c92bbf7c 100644
--- a/Library/Homebrew/os/mac.rb
+++ b/Library/Homebrew/os/mac.rb
@@ -81,17 +81,8 @@ module OS
     #      are available) is returned.
     #   3. If no SDKs are available, nil is returned.
     #
-    # If no specific SDK is requested:
-    #
-    #   1. For Xcode >= 7, the latest SDK is returned even if the latest SDK is
-    #      named after a newer OS version than the running OS. The
-    #      `MACOSX_DEPLOYMENT_TARGET` must be set to the OS for which you're
-    #      actually building (usually the running OS version).
-    #      - https://github.com/Homebrew/legacy-homebrew/pull/50355
-    #      - https://developer.apple.com/library/ios/documentation/DeveloperTools/Conceptual/WhatsNewXcode/Articles/Introduction.html#//apple_ref/doc/uid/TP40004626
-    #      Section "About SDKs and Simulator"
-    #   2. For Xcode < 7, proceed as if the SDK for the running OS version had
-    #      specifically been requested according to the rules above.
+    # If no specific SDK is requested, the SDK matching the OS version is returned,
+    # if available. Otherwise, the latest SDK is returned.
 
     def sdk(v = nil)
       @locator ||= if Xcode.installed?
diff --git a/Library/Homebrew/os/mac/sdk.rb b/Library/Homebrew/os/mac/sdk.rb
index 1fa1356f8d..a3a8dcf83d 100644
--- a/Library/Homebrew/os/mac/sdk.rb
+++ b/Library/Homebrew/os/mac/sdk.rb
@@ -33,7 +33,7 @@ module OS
       def sdk_if_applicable(v = nil)
         sdk = begin
           if v.nil?
-            (source_version.to_i >= 7) ? latest_sdk : sdk_for(OS::Mac.version)
+            sdk_for OS::Mac.version
           else
             sdk_for v
           end