diff --git a/thirdparty/openh264/HPKBUILD b/thirdparty/openh264/HPKBUILD
index 9090714d07f2b7b19c9e127daaec1f9dedd59edf..bd0650647e6a305a3298c6a25470de7bae5ffca3 100644
--- a/thirdparty/openh264/HPKBUILD
+++ b/thirdparty/openh264/HPKBUILD
@@ -74,7 +74,7 @@ prepare() {
 build() {
     cd $builddir-$ARCH-build
     envarch=$ARCH
-    $MAKE PREFIX=$destdir ARCH=$arch > $buildlog 2>&1
+    $MAKE PREFIX=$destdir ARCH=$arch OS=linux > $buildlog 2>&1
     ret=$?
     cd $OLDPWD
     ARCH=$envarch