diff --git a/Library/Homebrew/os/mac/xcode.rb b/Library/Homebrew/os/mac/xcode.rb
index 0edc942ae4..f88beb3286 100644
--- a/Library/Homebrew/os/mac/xcode.rb
+++ b/Library/Homebrew/os/mac/xcode.rb
@@ -353,7 +353,7 @@ module OS
       end
 
       def detect_version_from_clang_version
-        detect_clang_version&.sub(/^(\d+)00\./, "\\1.")
+        detect_clang_version&.sub(/^(\d+)0(\d)\./, "\\1.\\2.")
       end
 
       # Version string (a pretty long one) of the CLT package.