diff --git a/build/cross/Dockerfile.arm64 b/build/cross/Dockerfile.arm64
index 9b6e849a..e67d71dc 100644
--- a/build/cross/Dockerfile.arm64
+++ b/build/cross/Dockerfile.arm64
@@ -37,6 +37,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     wget \
     xz-utils \
     file \
+    rsync \
     gcc-aarch64-linux-gnu \
     g++-aarch64-linux-gnu \
     libc6-dev-arm64-cross \
diff --git a/build/cross/Dockerfile.armv7 b/build/cross/Dockerfile.armv7
index fc908f82..4e8f4617 100644
--- a/build/cross/Dockerfile.armv7
+++ b/build/cross/Dockerfile.armv7
@@ -37,6 +37,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     wget \
     xz-utils \
     file \
+    rsync \
     gcc-arm-linux-gnueabihf \
     g++-arm-linux-gnueabihf \
     libc6-dev-armhf-cross \
diff --git a/build/cross/Dockerfile.x86_64 b/build/cross/Dockerfile.x86_64
index ebaf9a82..46b15ac9 100644
--- a/build/cross/Dockerfile.x86_64
+++ b/build/cross/Dockerfile.x86_64
@@ -34,6 +34,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     llvm \
     wget \
     xz-utils \
+    rsync \
     # Autotools for libopus (requires autoreconf)
     autoconf \
     automake \