diff --git a/docker/x86_64/mingw64 b/docker/x86_64/mingw64
index 919bce1..a241d4d 100644
--- a/docker/x86_64/mingw64
+++ b/docker/x86_64/mingw64
@@ -263,6 +263,7 @@ RUN cd /3rd_party/mingw64 && sha256sum -c ./pkg-config-${MY_PKG_CONFIG_VERSION}.
     && tar xvzf /3rd_party/mingw64/pkg-config-${MY_PKG_CONFIG_VERSION}.tar.gz \
     && cd pkg-config-${MY_PKG_CONFIG_VERSION} \
     && ./configure \
+        CFLAGS='-std=gnu11' \
         --disable-nls \
         --disable-shared \
         --prefix=/usr/local \