diff --git a/groups.d/241.native_packages_inet.d/mblaze.package b/groups.d/241.native_packages_inet.d/mblaze.package
index a03f6b1..f3c98b1 100644
--- a/groups.d/241.native_packages_inet.d/mblaze.package
+++ b/groups.d/241.native_packages_inet.d/mblaze.package
@@ -1,6 +1,6 @@
 : ${PKG_MBLAZE_DEPENDS:="libiconv"};
 : ${PKG_MBLAZE_URLS_GIT:="mblaze=https://github.com/leahneukirchen/mblaze.git@master"};
-: ${PKG_MBLAZE_CFLAGS_BUILD:="${NATIVE_PACKAGES_CFLAGS_CONFIGURE}"};
+: ${PKG_MBLAZE_CFLAGS_BUILD:="${NATIVE_PACKAGES_CFLAGS_CONFIGURE} -D__winnt__"};
 : ${PKG_MBLAZE_LDFLAGS_BUILD:="${NATIVE_PACKAGES_LDFLAGS_CONFIGURE}"};
 : ${PKG_MBLAZE_BUILD_DIR:=mblaze};