diff --git a/rvsttd/setup.sh b/rvsttd/setup.sh
index 6326df8..d946829 100644
--- a/rvsttd/setup.sh
+++ b/rvsttd/setup.sh
@@ -67,6 +67,10 @@ if [ ! -f "${LIB_DIR}/libmoonshine.so" ]; then
     ORT_LIB_DIR="${LIB_DIR}"
     ORT_INCLUDE_DIR="${SOURCE_DIR}/core/third-party/onnxruntime/include"
 
+    # Patch CMake minimum version for older distros (Debian 11 ships 3.18)
+    sed -i 's/cmake_minimum_required(VERSION 3.22.1)/cmake_minimum_required(VERSION 3.18.4)/' \
+        "${SOURCE_DIR}/core/CMakeLists.txt" 2>/dev/null || true
+
     mkdir -p "${CMAKE_BUILD}"
     cd "${CMAKE_BUILD}"