diff --git a/include/boost/config/compiler/intel.hpp b/include/boost/config/compiler/intel.hpp
index ecfacc5e..7789b944 100644
--- a/include/boost/config/compiler/intel.hpp
+++ b/include/boost/config/compiler/intel.hpp
@@ -20,6 +20,9 @@
 
 #include <boost/config/compiler/visualc.hpp>
 
+#undef BOOST_MSVC
+#undef BOOST_MSVC_FULL_VER
+
 #if (__INTEL_COMPILER >= 1500) && (_MSC_VER >= 1900)
 //
 // These appear to be supported, even though VC++ may not support them:
@@ -36,6 +39,9 @@
 
 #include <boost/config/compiler/gcc.hpp>
 
+#undef BOOST_GCC_VERSION
+#undef BOOST_GCC_CXX11
+
 #endif
 
 #undef BOOST_COMPILER