diff --git a/Formula/gcc@4.9.rb b/Formula/gcc@4.9.rb
index f5d006b5d8..0e389cc863 100644
--- a/Formula/gcc@4.9.rb
+++ b/Formula/gcc@4.9.rb
@@ -76,8 +76,9 @@ class GccAT49 < Formula
 
   # The bottles are built on systems with the CLT installed, and do not work
   # out of the box on Xcode-only systems due to an incorrect sysroot.
-  def pour_bottle?
-    MacOS::CLT.installed?
+  pour_bottle? do
+    reason "The bottle needs the Xcode CLT to be installed."
+    satisfy { MacOS::CLT.installed? }
   end
 
   # GCC bootstraps itself, so it is OK to have an incompatible C++ stdlib