diff --git a/src/engine/build.sh b/src/engine/build.sh
index a1e4cd335..5b70c7066 100755
--- a/src/engine/build.sh
+++ b/src/engine/build.sh
@@ -177,7 +177,7 @@ case $B2_TOOLSET in
         ;;
 
         *cygwin*)
-        B2_CXX="${CXX} -x c++ -std=gnu11"
+        B2_CXX="${CXX} -x c++ -std=gnu++11"
         B2_CXXFLAGS_RELEASE="-O2 -s"
         B2_CXXFLAGS_DEBUG="-O0 -g"
         ;;