diff --git a/docker/mingw/Dockerfile b/docker/mingw/Dockerfile
index 050fb847..2c2b1da0 100644
--- a/docker/mingw/Dockerfile
+++ b/docker/mingw/Dockerfile
@@ -38,5 +38,6 @@ RUN /bin/bash -c "source /deps.sh && dk_deps"
 ADD build.sh /
 
 ARG REBUILD=0
+ARG PLUGIN=true
 
 RUN /bin/bash -c "source /build.sh && dk_build && dk_package"
diff --git a/docker/mingw/build.sh b/docker/mingw/build.sh
index ed5beed0..04a0ac30 100644
--- a/docker/mingw/build.sh
+++ b/docker/mingw/build.sh
@@ -85,8 +85,8 @@ dk_package() {
         cp ${DIST}/x86_64/bin/ss-${bin}.exe ss-${bin}-x64.exe
     done
     for bin in local server; do
-        cp ${DIST}/i686/bin/obfs-${bin}.exe obfs-${bin}-x86.exe
-        cp ${DIST}/x86_64/bin/obfs-${bin}.exe obfs-${bin}-x64.exe
+        cp ${DIST}/i686/bin/obfs-${bin}.exe obfs-${bin}-x86.exe || true
+        cp ${DIST}/x86_64/bin/obfs-${bin}.exe obfs-${bin}-x64.exe || true
     done
     pushd "$SRC/proj"
     GIT_REV="$(git rev-parse --short HEAD)"
diff --git a/libcork b/libcork
index d447acd7..c9b3ea96 160000
--- a/libcork
+++ b/libcork
@@ -1 +1 @@
-Subproject commit d447acd7d1c3615759db01287205434fec90a2b4
+Subproject commit c9b3ea9638b3adcbc07ee229fd630f439cdecae8