diff --git a/include/boost/config/compiler/gcc.hpp b/include/boost/config/compiler/gcc.hpp
index 5c8e231c..8ab02348 100644
--- a/include/boost/config/compiler/gcc.hpp
+++ b/include/boost/config/compiler/gcc.hpp
@@ -48,7 +48,7 @@
 // those platforms where we can know for sure). It will get turned off again
 // later if no threading API is detected.
 //
-#if !defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(linux) && !defined(__linux) && !defined(__linux__)
+#if !defined(__MINGW32__) && !defined(linux) && !defined(__linux) && !defined(__linux__)
 # define BOOST_HAS_THREADS
 #endif