diff --git a/tests/docker/dockerfiles/debian-hexagon-cross.docker b/tests/docker/dockerfiles/debian-hexagon-cross.docker
index 8d219bb81d76..c4238e893f34 100644
--- a/tests/docker/dockerfiles/debian-hexagon-cross.docker
+++ b/tests/docker/dockerfiles/debian-hexagon-cross.docker
@@ -43,7 +43,7 @@ RUN cat /etc/apt/sources.list | sed "s/^deb\ /deb-src /" >> /etc/apt/sources.lis
 # Install QEMU build deps for use in CI
 RUN apt update && \
     DEBIAN_FRONTEND=noninteractive apt install -yy eatmydata && \
-    DEBIAN_FRONTEND=noninteractive eatmydata apt install -yy git ninja-build && \
+    DEBIAN_FRONTEND=noninteractive eatmydata apt install -yy bison flex git ninja-build && \
     DEBIAN_FRONTEND=noninteractive eatmydata \
     apt build-dep -yy --arch-only qemu
 COPY --from=0 /usr/local /usr/local