diff --git a/docker/Dockerfile.linux.amd64 b/docker/Dockerfile.linux.amd64
index 4739649..9e5d08c 100644
--- a/docker/Dockerfile.linux.amd64
+++ b/docker/Dockerfile.linux.amd64
@@ -25,6 +25,7 @@ RUN yum-config-manager --add-repo http://www.nasm.us/nasm.repo && \
   python \
   gnutls \
   yasm \
+  which \
   libva-devel \
   zlib-devel \
   pkgconfig \