diff --git a/config/lyxinclude.m4 b/config/lyxinclude.m4
index 67a110b989..057caf491c 100644
--- a/config/lyxinclude.m4
+++ b/config/lyxinclude.m4
@@ -362,7 +362,8 @@ if test x$GXX = xyes; then
 	dnl the deprecated-register warning is very annoying with Qt4.x right now.
         AM_CXXFLAGS="$AM_CXXFLAGS -std=c++11 -Wno-deprecated-register";;
       *)
-        AM_CXXFLAGS="$AM_CXXFLAGS -std=c++11";;
+        AM_CXXFLAGS="$AM_CXXFLAGS -std=c++11"
+        AS_CASE([$host], [*cygwin*], [AM_CXXFLAGS="$AM_CXXFLAGS -U__STRICT_ANSI__"]);;
     esac
   fi