diff --git a/Formula/doxygen.rb b/Formula/doxygen.rb
index 9befcdef5f7..7c249e5cdb0 100644
--- a/Formula/doxygen.rb
+++ b/Formula/doxygen.rb
@@ -32,10 +32,6 @@ class Doxygen < Formula
                   tmake/lib/macosx-c++/tmake.conf
                   tmake/lib/macosx-intel-c++/tmake.conf
                   tmake/lib/macosx-uni-c++/tmake.conf ] do |s|
-      # otherwise clang may use up large amounts of RAM while
-      # processing localization files
-      # gcc doesn't support the flag
-      s.gsub! '-Wno-invalid-source-encoding', '' unless ENV.compiler == :clang
       # makefiles hardcode both cc and c++
       s.gsub! /cc$/, ENV.cc
       s.gsub! /c\+\+$/, ENV.cxx